diff --git a/mount/fmountat_linux.go b/mount/fmountat_linux.go
index 45732488d..705b95ede 100644
--- a/mount/fmountat_linux.go
+++ b/mount/fmountat_linux.go
@@ -26,8 +26,8 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-// FMountat performs mount from the provided directory.
-func FMountat(dirfd uintptr, source, target, fstype string, flags uintptr, data string) error {
+// fMountat performs mount from the provided directory.
+func fMountat(dirfd uintptr, source, target, fstype string, flags uintptr, data string) error {
 	var (
 		sourceP, targetP, fstypeP, dataP *byte
 		pid                              uintptr
diff --git a/mount/fmountat_linux_test.go b/mount/fmountat_linux_test.go
index 4f25acf9b..06b3a2667 100644
--- a/mount/fmountat_linux_test.go
+++ b/mount/fmountat_linux_test.go
@@ -88,7 +88,7 @@ func testFMountatNormal(t *testing.T, root string) {
 	defer f.Close()
 
 	// mount work to fs
-	if err = FMountat(f.Fd(), workdir, "fs", "bind", unix.MS_BIND|unix.MS_RDONLY, ""); err != nil {
+	if err = fMountat(f.Fd(), workdir, "fs", "bind", unix.MS_BIND|unix.MS_RDONLY, ""); err != nil {
 		t.Fatalf("expected no error here, but got error: %+v", err)
 	}
 	defer umount(t, fsdir)
@@ -124,7 +124,7 @@ func testFMountatWithFileFd(t *testing.T, root string) {
 	}
 	defer f.Close()
 
-	err = FMountat(f.Fd(), filepath.Join(root, "empty"), filepath.Join(root, "work"), "", 0, "")
+	err = fMountat(f.Fd(), filepath.Join(root, "empty"), filepath.Join(root, "work"), "", 0, "")
 	if !errors.Is(err, expectedErr) {
 		t.Fatalf("expected error %v, but got %v", expectedErr, errors.Cause(err))
 	}
@@ -145,7 +145,7 @@ func testFMountatWithInvalidSource(t *testing.T, root string) {
 	}
 	defer f.Close()
 
-	err = FMountat(f.Fd(), filepath.Join(root, "oops"), "at", "bind", unix.MS_BIND, "")
+	err = fMountat(f.Fd(), filepath.Join(root, "oops"), "at", "bind", unix.MS_BIND, "")
 	if !errors.Is(err, expectedErr) {
 		t.Fatalf("expected error %v, but got %v", expectedErr, err)
 	}
diff --git a/mount/mount_linux.go b/mount/mount_linux.go
index e0e066b31..31148049a 100644
--- a/mount/mount_linux.go
+++ b/mount/mount_linux.go
@@ -377,7 +377,7 @@ func mountAt(chdir string, source, target, fstype string, flags uintptr, data st
 	if !fs.IsDir() {
 		return errors.Wrap(errors.Errorf("%s is not dir", chdir), "failed to mountat")
 	}
-	return errors.Wrap(FMountat(f.Fd(), source, target, fstype, flags, data), "failed to mountat")
+	return errors.Wrap(fMountat(f.Fd(), source, target, fstype, flags, data), "failed to mountat")
 }
 
 func (m *Mount) mountWithHelper(helperBinary, typePrefix, target string) error {