diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index e41a9cb56b5ad9abed9ebb0fddbd906ce640000f..a634362cf23597084c249d21022fd09e501acb5c 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -5410,7 +5410,7 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
     
     SColumnIndex columnIndex = COLUMN_INDEX_INITIALIZER;
-    SStrToken    name = {.type = TK_STRING, .z = pItem->name, .n = strlen(pItem->name)};
+    SStrToken    name = {.type = TK_STRING, .z = pItem->name, .n = (uint32_t)strlen(pItem->name)};
     if (getColumnIndexByName(pCmd, &name, pQueryInfo, &columnIndex) != TSDB_CODE_SUCCESS) {
       return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg17);
     }
@@ -5447,7 +5447,7 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
     
     SColumnIndex columnIndex = COLUMN_INDEX_INITIALIZER;
-    SStrToken    name = {.type = TK_STRING, .z = pItem->name, .n = strlen(pItem->name)};
+    SStrToken    name = {.type = TK_STRING, .z = pItem->name, .n = (uint32_t)strlen(pItem->name)};
     if (getColumnIndexByName(pCmd, &name, pQueryInfo, &columnIndex) != TSDB_CODE_SUCCESS) {
       return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg17);
     }