diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 873e8f8133..39d70e1966 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -5616,7 +5616,7 @@ SOperatorInfo* createSLimitOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperator
     len += pExpr[i].base.resBytes;
   }
 
-  int32_t numOfCols = pInfo->orderColumnList != NULL? taosArrayGetSize(pInfo->orderColumnList):0;
+  int32_t numOfCols = pInfo->orderColumnList != NULL? (int32_t) taosArrayGetSize(pInfo->orderColumnList):0;
   pInfo->prevRow = calloc(1, (POINTER_BYTES * numOfCols + len));
   int32_t offset = POINTER_BYTES * numOfCols;