Index: kernel/generic/src/proc/scheduler.c
===================================================================
--- kernel/generic/src/proc/scheduler.c	(revision df58e448060bb6d63ea118d30cb9b3b9b8c059bf)
+++ kernel/generic/src/proc/scheduler.c	(revision 08641228799704f3d6fd7340e625e1f9bef1ca3c)
@@ -102,4 +102,5 @@
 #endif
 	
+#ifdef CONFIG_UDEBUG
 	if (THREAD->btrace) {
 		istate_t *istate = THREAD->udebug.uspace_state;
@@ -111,4 +112,5 @@
 		THREAD->btrace = false;
 	}
+#endif
 }