diff --git a/problems/1221.分割平衡字符串.md b/problems/1221.分割平衡字符串.md
index 94d7bca8..b587514a 100644
--- a/problems/1221.分割平衡字符串.md
+++ b/problems/1221.分割平衡字符串.md
@@ -117,7 +117,7 @@ class Solution:
                 diff -= 1
             else:
                 diff += 1
-            if tilt == 0:
+            if diff == 0:
                 ans += 1
         return ans
 ```