diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 9893e00d546f1cff635722fbf7cb07e5ba4dd5da..fa2c4f51725ad0e885281e7f41e81240df82cb85 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -1478,7 +1478,7 @@ static bool buildGroupbyInfo(const SSDataBlock *pSDataBlock, const SGroupbyExpr
       }
     }
   }
-  pInfo->totalBytes += strlen(GROUPBY_MULTI_COLUMN_DELIM) * pGroupbyExpr->numOfGroupCols;
+  pInfo->totalBytes += (int32_t)strlen(GROUPBY_MULTI_COLUMN_DELIM) * pGroupbyExpr->numOfGroupCols;
   
   return true;
 }
@@ -1522,7 +1522,7 @@ static bool isGroupbyKeyEqual(void *a, void *b, void *ext) {
        return false;  
     }
     offset += pDataInfo->bytes; 
-    offset += strlen(GROUPBY_MULTI_COLUMN_DELIM);
+    offset += (int32_t)strlen(GROUPBY_MULTI_COLUMN_DELIM);
   }
   return true;
 }