diff --git a/src/runtime/env_plan9.go b/src/runtime/env_plan9.go
index b988020d9c7..0e2588b5238 100644
--- a/src/runtime/env_plan9.go
+++ b/src/runtime/env_plan9.go
@@ -23,14 +23,14 @@ func gogetenv(key string) string {
 	}
 	n := seek(fd, 0, 2)
 	if n <= 0 {
-		close(fd)
+		closefd(fd)
 		return ""
 	}
 
 	p := make([]byte, n)
 
 	r := pread(fd, unsafe.Pointer(&p[0]), int32(n), 0)
-	close(fd)
+	closefd(fd)
 	if r < 0 {
 		return ""
 	}
diff --git a/src/runtime/export_test.go b/src/runtime/export_test.go
index 71fbcdeabd7..58ac34283f1 100644
--- a/src/runtime/export_test.go
+++ b/src/runtime/export_test.go
@@ -119,7 +119,7 @@ var Maxstring = &maxstring
 type Uintreg uintreg
 
 var Open = open
-var Close = close
+var Close = closefd
 var Read = read
 var Write = write
 
diff --git a/src/runtime/os1_darwin.go b/src/runtime/os1_darwin.go
index 9de6de9ff12..a4c98747001 100644
--- a/src/runtime/os1_darwin.go
+++ b/src/runtime/os1_darwin.go
@@ -51,7 +51,7 @@ var urandom_dev = []byte("/dev/urandom\x00")
 func getRandomData(r []byte) {
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	close(fd)
+	closefd(fd)
 	extendRandom(r, int(n))
 }
 
diff --git a/src/runtime/os1_dragonfly.go b/src/runtime/os1_dragonfly.go
index 54f19eff9f2..a590aea39be 100644
--- a/src/runtime/os1_dragonfly.go
+++ b/src/runtime/os1_dragonfly.go
@@ -105,7 +105,7 @@ var urandom_dev = []byte("/dev/urandom\x00")
 func getRandomData(r []byte) {
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	close(fd)
+	closefd(fd)
 	extendRandom(r, int(n))
 }
 
diff --git a/src/runtime/os1_freebsd.go b/src/runtime/os1_freebsd.go
index ceaa9162c07..8719a492868 100644
--- a/src/runtime/os1_freebsd.go
+++ b/src/runtime/os1_freebsd.go
@@ -104,7 +104,7 @@ var urandom_dev = []byte("/dev/urandom\x00")
 func getRandomData(r []byte) {
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	close(fd)
+	closefd(fd)
 	extendRandom(r, int(n))
 }
 
diff --git a/src/runtime/os1_linux.go b/src/runtime/os1_linux.go
index 44e7698bcf1..4214fa7cf7a 100644
--- a/src/runtime/os1_linux.go
+++ b/src/runtime/os1_linux.go
@@ -176,7 +176,7 @@ func getRandomData(r []byte) {
 	}
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	close(fd)
+	closefd(fd)
 	extendRandom(r, int(n))
 }
 
diff --git a/src/runtime/os1_netbsd.go b/src/runtime/os1_netbsd.go
index 85b3df33970..8df74b5593c 100644
--- a/src/runtime/os1_netbsd.go
+++ b/src/runtime/os1_netbsd.go
@@ -124,7 +124,7 @@ var urandom_dev = []byte("/dev/urandom\x00")
 func getRandomData(r []byte) {
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	close(fd)
+	closefd(fd)
 	extendRandom(r, int(n))
 }
 
diff --git a/src/runtime/os1_openbsd.go b/src/runtime/os1_openbsd.go
index 4f41864684b..95729a56df8 100644
--- a/src/runtime/os1_openbsd.go
+++ b/src/runtime/os1_openbsd.go
@@ -133,7 +133,7 @@ var urandom_dev = []byte("/dev/urandom\x00")
 func getRandomData(r []byte) {
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	close(fd)
+	closefd(fd)
 	extendRandom(r, int(n))
 }
 
diff --git a/src/runtime/os1_plan9.go b/src/runtime/os1_plan9.go
index 284f3381d78..c0262182416 100644
--- a/src/runtime/os1_plan9.go
+++ b/src/runtime/os1_plan9.go
@@ -50,7 +50,7 @@ func getproccount() int32 {
 			}
 		}
 	}
-	close(fd)
+	closefd(fd)
 	if ncpu == 0 {
 		ncpu = 1
 	}
@@ -64,7 +64,7 @@ func getpid() uint64 {
 	fd := open(&pid[0], 0, 0)
 	if fd >= 0 {
 		read(fd, unsafe.Pointer(&b), int32(len(b)))
-		close(fd)
+		closefd(fd)
 	}
 	c := b[:]
 	for c[0] == ' ' || c[0] == '\t' {
@@ -162,10 +162,10 @@ func postnote(pid uint64, msg []byte) int {
 	}
 	len := findnull(&msg[0])
 	if write(uintptr(fd), (unsafe.Pointer)(&msg[0]), int32(len)) != int64(len) {
-		close(fd)
+		closefd(fd)
 		return -1
 	}
-	close(fd)
+	closefd(fd)
 	return 0
 }
 
diff --git a/src/runtime/os3_solaris.go b/src/runtime/os3_solaris.go
index 7a4d27e20e0..f012943b0c7 100644
--- a/src/runtime/os3_solaris.go
+++ b/src/runtime/os3_solaris.go
@@ -173,7 +173,7 @@ var urandom_dev = []byte("/dev/urandom\x00")
 func getRandomData(r []byte) {
 	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
 	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
-	close(fd)
+	closefd(fd)
 	extendRandom(r, int(n))
 }
 
@@ -351,7 +351,7 @@ func semawakeup(mp *m) {
 }
 
 //go:nosplit
-func close(fd int32) int32 {
+func closefd(fd int32) int32 {
 	return int32(sysvicall1(libc_close, uintptr(fd)))
 }
 
diff --git a/src/runtime/os_nacl.go b/src/runtime/os_nacl.go
index a6a796cd76f..efa8fa12b91 100644
--- a/src/runtime/os_nacl.go
+++ b/src/runtime/os_nacl.go
@@ -55,5 +55,5 @@ func raiseproc(sig int32) {
 
 // Stubs so tests can link correctly.  These should never be called.
 func open(name *byte, mode, perm int32) int32
-func close(fd int32) int32
+func closefd(fd int32) int32
 func read(fd int32, p unsafe.Pointer, n int32) int32
diff --git a/src/runtime/os_plan9.go b/src/runtime/os_plan9.go
index 870404b948d..6def35ccade 100644
--- a/src/runtime/os_plan9.go
+++ b/src/runtime/os_plan9.go
@@ -6,7 +6,7 @@ package runtime
 
 import "unsafe"
 
-func close(fd int32) int32
+func closefd(fd int32) int32
 
 //go:noescape
 func open(name *byte, mode, perm int32) int32
diff --git a/src/runtime/os_windows.go b/src/runtime/os_windows.go
index 31df0649594..545b416201a 100644
--- a/src/runtime/os_windows.go
+++ b/src/runtime/os_windows.go
@@ -18,7 +18,7 @@ func open(name *byte, mode, perm int32) int32 {
 	throw("unimplemented")
 	return -1
 }
-func close(fd int32) int32 {
+func closefd(fd int32) int32 {
 	throw("unimplemented")
 	return -1
 }
diff --git a/src/runtime/stubs2.go b/src/runtime/stubs2.go
index 60751dd343d..1cb6f9123d8 100644
--- a/src/runtime/stubs2.go
+++ b/src/runtime/stubs2.go
@@ -12,7 +12,7 @@ package runtime
 import "unsafe"
 
 func read(fd int32, p unsafe.Pointer, n int32) int32
-func close(fd int32) int32
+func closefd(fd int32) int32
 
 func exit(code int32)
 func nanotime() int64
diff --git a/src/runtime/sys_darwin_386.s b/src/runtime/sys_darwin_386.s
index 6e1234567b7..abc5d3297ab 100644
--- a/src/runtime/sys_darwin_386.s
+++ b/src/runtime/sys_darwin_386.s
@@ -34,7 +34,7 @@ TEXT runtime·open(SB),NOSPLIT,$0
 	MOVL	AX, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVL	$6, AX
 	INT	$0x80
 	JAE	2(PC)
diff --git a/src/runtime/sys_darwin_amd64.s b/src/runtime/sys_darwin_amd64.s
index 2ec43014c68..3d0d3395b81 100644
--- a/src/runtime/sys_darwin_amd64.s
+++ b/src/runtime/sys_darwin_amd64.s
@@ -43,7 +43,7 @@ TEXT runtime·open(SB),NOSPLIT,$0
 	MOVL	AX, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVL	fd+0(FP), DI		// arg 1 fd
 	MOVL	$(0x2000000+6), AX	// syscall entry
 	SYSCALL
diff --git a/src/runtime/sys_darwin_arm.s b/src/runtime/sys_darwin_arm.s
index 870c3bff8f8..b4c1b275302 100644
--- a/src/runtime/sys_darwin_arm.s
+++ b/src/runtime/sys_darwin_arm.s
@@ -52,7 +52,7 @@ TEXT runtime·open(SB),NOSPLIT,$0
 	MOVW	R0, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVW	fd+0(FP), R0
 	MOVW	$SYS_close, R12
 	SWI	$0x80
diff --git a/src/runtime/sys_dragonfly_amd64.s b/src/runtime/sys_dragonfly_amd64.s
index 1227196cb7e..efda4326a46 100644
--- a/src/runtime/sys_dragonfly_amd64.s
+++ b/src/runtime/sys_dragonfly_amd64.s
@@ -82,7 +82,7 @@ TEXT runtime·open(SB),NOSPLIT,$-8
 	MOVL	AX, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-8
+TEXT runtime·closefd(SB),NOSPLIT,$-8
 	MOVL	fd+0(FP), DI		// arg 1 fd
 	MOVL	$6, AX
 	SYSCALL
diff --git a/src/runtime/sys_freebsd_386.s b/src/runtime/sys_freebsd_386.s
index eed6b8d691c..94b8d95044e 100644
--- a/src/runtime/sys_freebsd_386.s
+++ b/src/runtime/sys_freebsd_386.s
@@ -67,7 +67,7 @@ TEXT runtime·open(SB),NOSPLIT,$-4
 	MOVL	AX, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-4
+TEXT runtime·closefd(SB),NOSPLIT,$-4
 	MOVL	$6, AX
 	INT	$0x80
 	JAE	2(PC)
diff --git a/src/runtime/sys_freebsd_amd64.s b/src/runtime/sys_freebsd_amd64.s
index ecc40e3946f..a9a621b095e 100644
--- a/src/runtime/sys_freebsd_amd64.s
+++ b/src/runtime/sys_freebsd_amd64.s
@@ -72,7 +72,7 @@ TEXT runtime·open(SB),NOSPLIT,$-8
 	MOVL	AX, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-8
+TEXT runtime·closefd(SB),NOSPLIT,$-8
 	MOVL	fd+0(FP), DI		// arg 1 fd
 	MOVL	$6, AX
 	SYSCALL
diff --git a/src/runtime/sys_freebsd_arm.s b/src/runtime/sys_freebsd_arm.s
index 613c1dceed2..2b5d754590b 100644
--- a/src/runtime/sys_freebsd_arm.s
+++ b/src/runtime/sys_freebsd_arm.s
@@ -117,7 +117,7 @@ TEXT runtime·write(SB),NOSPLIT,$-8
 	MOVW	R0, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-8
+TEXT runtime·closefd(SB),NOSPLIT,$-8
 	MOVW fd+0(FP), R0	// arg 1 fd
 	MOVW $SYS_close, R7
 	SWI $0
diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s
index e3fae4cb93a..d69054feb54 100644
--- a/src/runtime/sys_linux_386.s
+++ b/src/runtime/sys_linux_386.s
@@ -36,7 +36,7 @@ TEXT runtime·open(SB),NOSPLIT,$0
 	MOVL	AX, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVL	$6, AX		// syscall - close
 	MOVL	fd+0(FP), BX
 	CALL	*runtime·_vdso(SB)
diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s
index e170b2e7f7f..43a65b7ccdb 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -34,7 +34,7 @@ TEXT runtime·open(SB),NOSPLIT,$0-20
 	MOVL	AX, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0-12
+TEXT runtime·closefd(SB),NOSPLIT,$0-12
 	MOVL	fd+0(FP), DI
 	MOVL	$3, AX			// syscall entry
 	SYSCALL
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s
index d422f95f083..bbd7eb9eb3a 100644
--- a/src/runtime/sys_linux_arm.s
+++ b/src/runtime/sys_linux_arm.s
@@ -63,7 +63,7 @@ TEXT runtime·open(SB),NOSPLIT,$0
 	MOVW	R0, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVW	fd+0(FP), R0
 	MOVW	$SYS_close, R7
 	SWI	$0
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index df7a9b49422..32404570fe8 100644
--- a/src/runtime/sys_linux_arm64.s
+++ b/src/runtime/sys_linux_arm64.s
@@ -68,7 +68,7 @@ done:
 	MOVW	R0, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-8-12
+TEXT runtime·closefd(SB),NOSPLIT,$-8-12
 	MOVW	fd+0(FP), R0
 	MOVD	$SYS_close, R8
 	SVC
diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s
index b0477d3c2f6..fd7ce4fa486 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -67,7 +67,7 @@ TEXT runtime·open(SB),NOSPLIT,$-8-20
 	MOVW	R3, ret+16(FP)
 	RETURN
 
-TEXT runtime·close(SB),NOSPLIT,$-8-12
+TEXT runtime·closefd(SB),NOSPLIT,$-8-12
 	MOVW	fd+0(FP), R3
 	SYSCALL	$SYS_close
 	BVC	2(PC)
diff --git a/src/runtime/sys_nacl_386.s b/src/runtime/sys_nacl_386.s
index 242040dd977..f8e7196bd32 100644
--- a/src/runtime/sys_nacl_386.s
+++ b/src/runtime/sys_nacl_386.s
@@ -33,7 +33,7 @@ TEXT runtime·open(SB),NOSPLIT,$12
 	MOVL AX, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$4
+TEXT runtime·closefd(SB),NOSPLIT,$4
 	MOVL fd+0(FP), AX
 	MOVL AX, 0(SP)
 	NACL_SYSCALL(SYS_close)
diff --git a/src/runtime/sys_nacl_amd64p32.s b/src/runtime/sys_nacl_amd64p32.s
index 821610be899..0b29c9f889e 100644
--- a/src/runtime/sys_nacl_amd64p32.s
+++ b/src/runtime/sys_nacl_amd64p32.s
@@ -32,7 +32,7 @@ TEXT runtime·open(SB),NOSPLIT,$0
 	MOVL AX, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVL fd+0(FP), DI
 	NACL_SYSCALL(SYS_close)
 	MOVL AX, ret+8(FP)
diff --git a/src/runtime/sys_nacl_arm.s b/src/runtime/sys_nacl_arm.s
index 1bae0b31ec1..39ef25a618b 100644
--- a/src/runtime/sys_nacl_arm.s
+++ b/src/runtime/sys_nacl_arm.s
@@ -28,7 +28,7 @@ TEXT runtime·open(SB),NOSPLIT,$0
 	MOVW	R0, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVW	fd+0(FP), R0
 	NACL_SYSCALL(SYS_close)
 	MOVW	R0, ret+4(FP)
diff --git a/src/runtime/sys_netbsd_386.s b/src/runtime/sys_netbsd_386.s
index bfa7928df78..b43a72e60ff 100644
--- a/src/runtime/sys_netbsd_386.s
+++ b/src/runtime/sys_netbsd_386.s
@@ -32,7 +32,7 @@ TEXT runtime·open(SB),NOSPLIT,$-4
 	MOVL	AX, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-4
+TEXT runtime·closefd(SB),NOSPLIT,$-4
 	MOVL	$6, AX
 	INT	$0x80
 	JAE	2(PC)
diff --git a/src/runtime/sys_netbsd_amd64.s b/src/runtime/sys_netbsd_amd64.s
index a138286d863..5c1d957b372 100644
--- a/src/runtime/sys_netbsd_amd64.s
+++ b/src/runtime/sys_netbsd_amd64.s
@@ -96,7 +96,7 @@ TEXT runtime·open(SB),NOSPLIT,$-8
 	MOVL	AX, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-8
+TEXT runtime·closefd(SB),NOSPLIT,$-8
 	MOVL	fd+0(FP), DI		// arg 1 fd
 	MOVL	$6, AX
 	SYSCALL
diff --git a/src/runtime/sys_netbsd_arm.s b/src/runtime/sys_netbsd_arm.s
index b4210228312..d275d6d0b66 100644
--- a/src/runtime/sys_netbsd_arm.s
+++ b/src/runtime/sys_netbsd_arm.s
@@ -33,7 +33,7 @@ TEXT runtime·open(SB),NOSPLIT,$-8
 	MOVW	R0, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-8
+TEXT runtime·closefd(SB),NOSPLIT,$-8
 	MOVW fd+0(FP), R0
 	SWI $0xa00006
 	MOVW.CS	$-1, R0
diff --git a/src/runtime/sys_openbsd_386.s b/src/runtime/sys_openbsd_386.s
index 10877096d43..fa3f0d9bee3 100644
--- a/src/runtime/sys_openbsd_386.s
+++ b/src/runtime/sys_openbsd_386.s
@@ -36,7 +36,7 @@ TEXT runtime·open(SB),NOSPLIT,$-4
 	MOVL	AX, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-4
+TEXT runtime·closefd(SB),NOSPLIT,$-4
 	MOVL	$6, AX
 	INT	$0x80
 	JAE	2(PC)
diff --git a/src/runtime/sys_openbsd_amd64.s b/src/runtime/sys_openbsd_amd64.s
index d05782c181d..185b82db1a4 100644
--- a/src/runtime/sys_openbsd_amd64.s
+++ b/src/runtime/sys_openbsd_amd64.s
@@ -106,7 +106,7 @@ TEXT runtime·open(SB),NOSPLIT,$-8
 	MOVL	AX, ret+16(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-8
+TEXT runtime·closefd(SB),NOSPLIT,$-8
 	MOVL	fd+0(FP), DI		// arg 1 fd
 	MOVL	$6, AX
 	SYSCALL
diff --git a/src/runtime/sys_openbsd_arm.s b/src/runtime/sys_openbsd_arm.s
index f1be7751aeb..e28d43eeaad 100644
--- a/src/runtime/sys_openbsd_arm.s
+++ b/src/runtime/sys_openbsd_arm.s
@@ -40,7 +40,7 @@ TEXT runtime·open(SB),NOSPLIT,$-4
 	MOVW	R0, ret+12(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$-4
+TEXT runtime·closefd(SB),NOSPLIT,$-4
 	MOVW	path+0(FP), R0		// arg 1 - path
 	MOVW	$6, R12			// sys_close
 	SWI	$0
diff --git a/src/runtime/sys_plan9_386.s b/src/runtime/sys_plan9_386.s
index b9db8cbf1a5..cae326ada63 100644
--- a/src/runtime/sys_plan9_386.s
+++ b/src/runtime/sys_plan9_386.s
@@ -52,7 +52,7 @@ TEXT runtime·seek(SB),NOSPLIT,$24
 	MOVL	$-1, ret_hi+20(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVL	$4, AX
 	INT	$64
 	MOVL	AX, ret+4(FP)
diff --git a/src/runtime/sys_plan9_amd64.s b/src/runtime/sys_plan9_amd64.s
index 02c7c8743eb..6aefe5f125f 100644
--- a/src/runtime/sys_plan9_amd64.s
+++ b/src/runtime/sys_plan9_amd64.s
@@ -51,7 +51,7 @@ TEXT runtime·seek(SB),NOSPLIT,$32
 	MOVQ	$-1, ret+24(FP)
 	RET
 
-TEXT runtime·close(SB),NOSPLIT,$0
+TEXT runtime·closefd(SB),NOSPLIT,$0
 	MOVQ	$4, BP
 	SYSCALL
 	MOVL	AX, ret+8(FP)