diff --git a/src/internal/syscall/unix/fallocate_freebsd_32bit.go b/src/internal/syscall/unix/fallocate_freebsd_32bit.go
new file mode 100644
index 00000000000..d821eea81c3
--- /dev/null
+++ b/src/internal/syscall/unix/fallocate_freebsd_32bit.go
@@ -0,0 +1,20 @@
+// Copyright 2023 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 freebsd && (386 || arm)
+
+package unix
+
+import "syscall"
+
+// FreeBSD posix_fallocate system call number.
+const posixFallocateTrap uintptr = 530
+
+func PosixFallocate(fd int, off int64, size int64) error {
+	_, _, errno := syscall.Syscall6(posixFallocateTrap, uintptr(fd), uintptr(off), uintptr(off>>32), uintptr(size), uintptr(size>>32), 0)
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
diff --git a/src/internal/syscall/unix/fallocate_freebsd.go b/src/internal/syscall/unix/fallocate_freebsd_64bit.go
similarity index 90%
rename from src/internal/syscall/unix/fallocate_freebsd.go
rename to src/internal/syscall/unix/fallocate_freebsd_64bit.go
index 6c3e80118b0..f1ef6e347ca 100644
--- a/src/internal/syscall/unix/fallocate_freebsd.go
+++ b/src/internal/syscall/unix/fallocate_freebsd_64bit.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build freebsd && (amd64 || arm64 || riscv64)
+
 package unix
 
 import "syscall"