diff --git a/sched/clock/clock_systime_ticks.c b/sched/clock/clock_systime_ticks.c
index debad32b7e0..e80dd318c0c 100644
--- a/sched/clock/clock_systime_ticks.c
+++ b/sched/clock/clock_systime_ticks.c
@@ -34,14 +34,6 @@
 
 #include "clock/clock.h"
 
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-/* See nuttx/clock.h */
-
-#undef clock_systime_ticks
-
 /****************************************************************************
  * Public Functions
  ****************************************************************************/