diff --git a/core/include/sched.h b/core/include/sched.h
index 0c11db12ef..67c85fa203 100644
--- a/core/include/sched.h
+++ b/core/include/sched.h
@@ -179,7 +179,7 @@ NORETURN void sched_task_exit(void);
  *  Scheduler statistics
  */
 typedef struct {
-    uint64_t laststart;      /**< Time stamp of the last time this thread was
+    uint32_t laststart;      /**< Time stamp of the last time this thread was
                                   scheduled to run */
     unsigned int schedules;  /**< How often the thread was scheduled to run */
     uint64_t runtime_ticks;  /**< The total runtime of this thread in ticks */
diff --git a/core/sched.c b/core/sched.c
index 59ed1f5f9f..b132a1a7e7 100644
--- a/core/sched.c
+++ b/core/sched.c
@@ -101,7 +101,7 @@ int __attribute__((used)) sched_run(void)
     }
 
 #ifdef MODULE_SCHEDSTATISTICS
-    uint64_t now = _xtimer_now64();
+    uint32_t now = xtimer_now().ticks32;
 #endif
 
     if (active_thread) {