diff --git a/core/include/sched.h b/core/include/sched.h
index c30c4ca64..b26cdc7ab 100644
--- a/core/include/sched.h
+++ b/core/include/sched.h
@@ -36,7 +36,6 @@ extern volatile tcb_t *active_thread;
 extern volatile int num_tasks;
 extern volatile int thread_pid;
 
-//#define SCHEDSTATISTICS
 #if SCHEDSTATISTICS
 
 typedef struct {
@@ -46,6 +45,8 @@ typedef struct {
 } schedstat;
 
 extern schedstat pidlist[MAXTHREADS];
+
+void sched_register_cb(void (*callback)(uint32_t, uint32_t));
 #endif
 
 /** @} */
diff --git a/core/sched.c b/core/sched.c
index eb09a629a..c980dd5d5 100644
--- a/core/sched.c
+++ b/core/sched.c
@@ -37,9 +37,6 @@ volatile int last_pid = -1;
 clist_node_t *runqueues[SCHED_PRIO_LEVELS];
 static uint32_t runqueue_bitcache = 0;
 
-void sched_register_cb(void (*callback)(uint32_t, uint32_t));
-
-
 #if SCHEDSTATISTICS
 static void (*sched_cb) (uint32_t timestamp, uint32_t value) = NULL;
 schedstat pidlist[MAXTHREADS];