diff --git a/include/mount.h b/include/mount.h
index d0a28d81a..c3abc8479 100644
--- a/include/mount.h
+++ b/include/mount.h
@@ -94,6 +94,7 @@ extern int mntns_get_root_by_mnt_id(int mnt_id);
 extern struct ns_id *lookup_nsid_by_mnt_id(int mnt_id);
 
 extern int open_mount(unsigned int s_dev);
+extern int __open_mountpoint(struct mount_info *pm, int mnt_fd);
 extern struct fstype *find_fstype_by_name(char *fst);
 extern bool add_fsname_auto(const char *names);
 
diff --git a/mount.c b/mount.c
index 37ed0a830..25fbc134e 100644
--- a/mount.c
+++ b/mount.c
@@ -982,7 +982,7 @@ static struct mount_info *mnt_build_tree(struct mount_info *list)
  * mnt_fd is a file descriptor on the mountpoint, which is closed in an error case.
  * If mnt_fd is -1, the mountpoint will be opened by this function.
  */
-static int __open_mountpoint(struct mount_info *pm, int mnt_fd)
+int __open_mountpoint(struct mount_info *pm, int mnt_fd)
 {
 	dev_t dev;
 	struct stat st;