diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index b1b615ff4ea303161e71029a765bef762f322559..7811f39e33529476d361881f4291189530e4c510 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -443,7 +443,7 @@ static int taos_set_config_imp(const char *config){
   static bool setConfFlag = false;
   if (setConfFlag) {
     tscError("already set config");
-    return -1;
+    return 0;
   }
   cJSON *root = cJSON_Parse(config);
   if (root == NULL) {