diff --git a/sched/clock/clock.h b/sched/clock/clock.h
index 71b80297b09..4ea585f3ea2 100644
--- a/sched/clock/clock.h
+++ b/sched/clock/clock.h
@@ -39,10 +39,6 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-/* 32-bit mask for 64-bit timer values */
-
-#define TIMER_MASK32 0x00000000ffffffff
-
 /* Configuration ************************************************************/
 
 /* If CONFIG_SYSTEM_TIME64 is selected and the CPU supports long long types,