diff --git a/source/libs/function/test/udf1.c b/source/libs/function/test/udf1.c
index b53f82c3e99502d0316410e0c388f4e3503ced5f..5be18af553498bf2b05607b69223c302d3826fae 100644
--- a/source/libs/function/test/udf1.c
+++ b/source/libs/function/test/udf1.c
@@ -1,8 +1,12 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#ifdef LINUX
 #include <unistd.h>
-
+#endif
+#ifdef WINDOWS
+#include <windows.h>
+#endif
 #include "taosudf.h"
 
 
@@ -37,17 +41,11 @@ DLL_EXPORT int32_t udf1(SUdfDataBlock* block, SUdfColumn *resultCol) {
     }
   }
   //to simulate actual processing delay by udf
+#ifdef LINUX
+  usleep(1 * 1000);   // usleep takes sleep time in us (1 millionth of a second)
+#endif
 #ifdef WINDOWS
-  HANDLE timer;
-  LARGE_INTEGER interval;
-  interval.QuadPart = (10 * 1000);
-
-  timer = CreateWaitableTimer(NULL, TRUE, NULL);
-  SetWaitableTimer(timer, &interval, 0, NULL, NULL, 0);
-  WaitForSingleObject(timer, INFINITE);
-  CloseHandle(timer);
-#else
-  usleep(1000);
+  Sleep(1);
 #endif
   return 0;
 }
\ No newline at end of file