diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 4851966c3081..be06e66e3178 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3010,13 +3010,13 @@ static bool can_resize(struct cache *cache, dm_cblock_t new_size)
 	 * We can't drop a dirty block when shrinking the cache.
 	 */
 	while (from_cblock(new_size) < from_cblock(cache->cache_size)) {
-		new_size = to_cblock(from_cblock(new_size) + 1);
 		if (is_dirty(cache, new_size)) {
 			DMERR("%s: unable to shrink cache; cache block %llu is dirty",
 			      cache_device_name(cache),
 			      (unsigned long long) from_cblock(new_size));
 			return false;
 		}
+		new_size = to_cblock(from_cblock(new_size) + 1);
 	}
 
 	return true;