diff --git a/src/shared/mount-util.c b/src/shared/mount-util.c
index a7493a3814..02640a13a9 100644
--- a/src/shared/mount-util.c
+++ b/src/shared/mount-util.c
@@ -1378,12 +1378,12 @@ int remount_idmap_fd(
         int *mount_fds = NULL;
         size_t n_mounts_fds = 0;
 
-        CLEANUP_ARRAY(mount_fds, n_mounts_fds, close_many_and_free);
-
         mount_fds = new(int, n);
         if (!mount_fds)
                 return log_oom_debug();
 
+        CLEANUP_ARRAY(mount_fds, n_mounts_fds, close_many_and_free);
+
         for (size_t i = 0; i < n; i++) {
                 int mntfd;