diff --git a/problems/0150.逆波兰表达式求值.md b/problems/0150.逆波兰表达式求值.md
index 48e99c5b..7d4031d7 100644
--- a/problems/0150.逆波兰表达式求值.md
+++ b/problems/0150.逆波兰表达式求值.md
@@ -108,7 +108,7 @@ public:
             }
         }
 
-        int result = st.top();
+        long long result = st.top();
         st.pop(); // 把栈里最后一个元素弹出（其实不弹出也没事）
         return result;
     }