diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 21c50dcbc9f09..2b21ccd55cd4a 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -203,7 +203,7 @@ static __always_inline bool memory_is_poisoned_n(unsigned long addr,
 		s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte);
 
 		if (unlikely(ret != (unsigned long)last_shadow ||
-			((last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
+			((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
 			return true;
 	}
 	return false;