diff --git a/src/client/src/tscAsync.c b/src/client/src/tscAsync.c
index b00e82f65a1b79e90ae41362466ff2b971ec8557..dc4b91ad1f57b5033e343518a2a51d6241a00e5e 100644
--- a/src/client/src/tscAsync.c
+++ b/src/client/src/tscAsync.c
@@ -335,11 +335,10 @@ bool appendTagsFilter(SSqlObj* pSql) {
   }
 
   // check tags is blank
-  size_t len = strlen(pTscObj->tags);
-  char* p = pTscObj->tags;
+  char* p1 = pTscObj->tags;
   bool blank = true;
-  while(*p != 0) {
-    if(*p != ' ') {
+  while(*p1 != 0) {
+    if(*p1 != ' ') {
       blank = false;
       break;
     }