diff --git a/testing/sched/timerjitter/timerjitter.c b/testing/sched/timerjitter/timerjitter.c
index 56697b2bc..01eed10d5 100644
--- a/testing/sched/timerjitter/timerjitter.c
+++ b/testing/sched/timerjitter/timerjitter.c
@@ -35,8 +35,8 @@
  ****************************************************************************/
 
 #define DEFAULT_CLOCKID   CLOCK_REALTIME
-#define DEFAULT_INTERVAL  1000 * USEC_PER_TICK
-#define DEFAULT_ITERATION 1000
+#define DEFAULT_INTERVAL  (1000 * USEC_PER_TICK)
+#define DEFAULT_ITERATION (USEC_PER_SEC / DEFAULT_INTERVAL)
 
 /* Fix compilation error for Non-NuttX OS */
 #ifndef FAR