diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index 24855ab8b51a87aed91ac10e8278941fe60bfee1..6364e70788652e5f37fb276a6ebc0ae0b1a0288b 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -343,7 +343,7 @@ int main(int argc, char *argv[]) {
   if (strcasecmp(data_type[0], "BINARY") == 0 || strcasecmp(data_type[0], "BOOL") == 0) {
     do_aggreFunc = false;
   }
-  for (; count_data_type <= MAX_NUM_DATATYPE; count_data_type++) {
+  for (; count_data_type < MAX_NUM_DATATYPE; count_data_type++) {
     if (strcasecmp(data_type[count_data_type], "") == 0) {
       break;
     }