diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 447de9de93ebffa7103c3913bd9257ac1095a410..db626b05e8e7bdd4c0ce70dde7b268d7a1b366b9 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -6031,7 +6031,7 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
 
     int32_t schemaLen = sizeof(STColumn) * numOfTags;
-    int32_t size = = sizeof(SUpdateTableTagValMsg) + pTagsSchema->bytes + schemaLen + TSDB_EXTRA_PAYLOAD_SIZE;
+    int32_t size = sizeof(SUpdateTableTagValMsg) + pTagsSchema->bytes + schemaLen + TSDB_EXTRA_PAYLOAD_SIZE;
 
     if (TSDB_CODE_SUCCESS != tscAllocPayload(pCmd, size)) {
       tscError("0x%"PRIx64" failed to malloc for alter table pMsg", pSql->self);