diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 6ce40b92040836d5e4d8dd7575f3e8b6aa618079..0c07149e8e0b20e91123d9491ab25acfff75f5d4 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -4524,7 +4524,7 @@ static void doCopyQueryResultToMsg(SQInfo *pQInfo, int32_t numOfRows, char *data
     }
   }
 
-  int32_t numOfTables = taosHashGetSize(pQInfo->arrTableIdInfo);
+  int32_t numOfTables = (int32_t) taosHashGetSize(pQInfo->arrTableIdInfo);
   *(int32_t*)data = htonl(numOfTables);
   data += sizeof(int32_t);