diff --git a/include/util/tdef.h b/include/util/tdef.h
index ad7206f7bb1d5840a779cfcddbff6680538ad8d8..7c1f46ce69715431e073f2e5d0af473aa66c8a6f 100644
--- a/include/util/tdef.h
+++ b/include/util/tdef.h
@@ -368,7 +368,11 @@ typedef enum ELogicConditionType {
 #define PRIMARYKEY_TIMESTAMP_COL_ID    1
 #define COL_REACH_END(colId, maxColId) ((colId) > (maxColId))
 
+#ifdef WINDOWS
+#define TSDB_MAX_RPC_THREADS 4  // windows pipe only support 4 connections.
+#else
 #define TSDB_MAX_RPC_THREADS 5
+#endif
 
 #define TSDB_QUERY_TYPE_NON_TYPE      0x00u  // none type
 #define TSDB_QUERY_TYPE_FREE_RESOURCE 0x01u  // free qhandle at vnode
diff --git a/source/libs/transport/test/CMakeLists.txt b/source/libs/transport/test/CMakeLists.txt
index 468b70fb711a15a83c97a5a45adb68dee3d1c368..98a252e008d85b27206fa58055f757dd02d64a78 100644
--- a/source/libs/transport/test/CMakeLists.txt
+++ b/source/libs/transport/test/CMakeLists.txt
@@ -111,12 +111,10 @@ target_link_libraries (pushServer
 )
 
 
-if(NOT TD_WINDOWS)
-  add_test(
-    NAME transUT 
-    COMMAND transUT 
-  )
-endif(NOT TD_WINDOWS)
+add_test(
+  NAME transUT 
+  COMMAND transUT 
+)
 add_test(
   NAME transUtilUt 
   COMMAND transportTest