diff --git a/src/common/src/tglobal.c b/src/common/src/tglobal.c
index 43b63de935..a2d02be683 100644
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@@ -1490,7 +1490,7 @@ int32_t taosCheckGlobalCfg() {
   tsHttpPort = tsServerPort + TSDB_PORT_HTTP;
 
   if (tsQueryBufferSize >= 0) {
-    tsQueryBufferSizeBytes = tsQueryBufferSize * 1048576;
+    tsQueryBufferSizeBytes = tsQueryBufferSize * 1048576UL;
   }
 
   taosPrintGlobalCfg();