diff --git a/tests/rm/rm-readdir-fail.sh b/tests/rm/rm-readdir-fail.sh
index 75fa339db..8d74aaefd 100755
--- a/tests/rm/rm-readdir-fail.sh
+++ b/tests/rm/rm-readdir-fail.sh
@@ -55,6 +55,8 @@ struct dirent *readdir (DIR *dirp)
       return NULL;
     }
 
+  if ((long) (d) % _Alignof (struct dirent) != 0)
+    abort ();
   /* Flag that LD_PRELOAD and above functions work.  */
   static int count = 1;
   if (count == 1)