diff --git a/mm/mremap.c b/mm/mremap.c
index dda09e957a5d..dee98ff2bbd6 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -648,7 +648,7 @@ again:
 	 * Prevent negative return values when {old,new}_addr was realigned
 	 * but we broke out of the above loop for the first PMD itself.
 	 */
-	if (len + old_addr < old_end)
+	if (old_addr < old_end - len)
 		return 0;
 
 	return len + old_addr - old_end;	/* how much done */