diff --git a/src/internal/poll/fd_fsync_darwin.go b/src/internal/poll/fd_fsync_darwin.go
index 731b7fd5bd..e55b490d41 100644
--- a/src/internal/poll/fd_fsync_darwin.go
+++ b/src/internal/poll/fd_fsync_darwin.go
@@ -5,6 +5,7 @@
 package poll
 
 import (
+	"errors"
 	"internal/syscall/unix"
 	"syscall"
 )
@@ -19,6 +20,13 @@ func (fd *FD) Fsync() error {
 	defer fd.decref()
 	return ignoringEINTR(func() error {
 		_, err := unix.Fcntl(fd.Sysfd, syscall.F_FULLFSYNC, 0)
+
+		// There are scenarios such as SMB mounts where fcntl will fail
+		// with ENOTSUP. In those cases fallback to fsync.
+		// See #64215
+		if err != nil && errors.Is(err, syscall.ENOTSUP) {
+			err = syscall.Fsync(fd.Sysfd)
+		}
 		return err
 	})
 }