diff --git a/src/syscall/exec_linux.go b/src/syscall/exec_linux.go
index 68bce7559b9..dfc52285456 100644
--- a/src/syscall/exec_linux.go
+++ b/src/syscall/exec_linux.go
@@ -448,13 +448,7 @@ func forkAndExecInChild1(argv0 *byte, argv, envv []*byte, chroot, dir *byte, att
 	// so that pass 2 won't stomp on an fd it needs later.
 	if pipe < nextfd {
 		_, _, err1 = RawSyscall(SYS_DUP3, uintptr(pipe), uintptr(nextfd), O_CLOEXEC)
-		if _SYS_dup != SYS_DUP3 && err1 == ENOSYS {
-			_, _, err1 = RawSyscall(_SYS_dup, uintptr(pipe), uintptr(nextfd), 0)
-			if err1 != 0 {
-				goto childerror
-			}
-			RawSyscall(fcntl64Syscall, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
-		} else if err1 != 0 {
+		if err1 != 0 {
 			goto childerror
 		}
 		pipe = nextfd
@@ -466,13 +460,7 @@ func forkAndExecInChild1(argv0 *byte, argv, envv []*byte, chroot, dir *byte, att
 				nextfd++
 			}
 			_, _, err1 = RawSyscall(SYS_DUP3, uintptr(fd[i]), uintptr(nextfd), O_CLOEXEC)
-			if _SYS_dup != SYS_DUP3 && err1 == ENOSYS {
-				_, _, err1 = RawSyscall(_SYS_dup, uintptr(fd[i]), uintptr(nextfd), 0)
-				if err1 != 0 {
-					goto childerror
-				}
-				RawSyscall(fcntl64Syscall, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
-			} else if err1 != 0 {
+			if err1 != 0 {
 				goto childerror
 			}
 			fd[i] = nextfd
@@ -497,7 +485,7 @@ func forkAndExecInChild1(argv0 *byte, argv, envv []*byte, chroot, dir *byte, att
 		}
 		// The new fd is created NOT close-on-exec,
 		// which is exactly what we want.
-		_, _, err1 = RawSyscall(_SYS_dup, uintptr(fd[i]), uintptr(i), 0)
+		_, _, err1 = RawSyscall(SYS_DUP3, uintptr(fd[i]), uintptr(i), 0)
 		if err1 != 0 {
 			goto childerror
 		}
diff --git a/src/syscall/syscall_dup2_linux.go b/src/syscall/syscall_dup2_linux.go
deleted file mode 100644
index 351a96edc18..00000000000
--- a/src/syscall/syscall_dup2_linux.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !android && (386 || amd64 || arm || mips || mipsle || mips64 || mips64le || ppc64 || ppc64le || s390x)
-// +build !android
-// +build 386 amd64 arm mips mipsle mips64 mips64le ppc64 ppc64le s390x
-
-package syscall
-
-const _SYS_dup = SYS_DUP2
diff --git a/src/syscall/syscall_dup3_linux.go b/src/syscall/syscall_dup3_linux.go
deleted file mode 100644
index 66ec67b0ab4..00000000000
--- a/src/syscall/syscall_dup3_linux.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// Copyright 2020 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build android || arm64 || riscv64
-// +build android arm64 riscv64
-
-package syscall
-
-const _SYS_dup = SYS_DUP3