diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index ffde345817022645e64325c5f2c292032620dcb3..1af8eaac2eee44831d32f2e2c93dec294dddaaff 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -2684,7 +2684,7 @@ void tscDequoteAndTrimToken(SStrToken* pToken) {
   // trim leading spaces
   while (first < last) {
     char c = pToken->z[first];
-    if (isspace(c)) {
+    if (c != ' ' && c != '\t') {
       break;
     }
     first++;
@@ -2693,7 +2693,7 @@ void tscDequoteAndTrimToken(SStrToken* pToken) {
   // trim ending spaces
   while (first < last) {
     char c = pToken->z[last - 1];
-    if (isspace(c)) {
+    if (c != ' ' && c != '\t') {
       break;
     }
     last--;