Index: kernel/generic/src/proc/scheduler.c
===================================================================
--- kernel/generic/src/proc/scheduler.c	(revision df58e448060bb6d63ea118d30cb9b3b9b8c059bf)
+++ kernel/generic/src/proc/scheduler.c	(revision 1879a7de2821a2ed5d8b048b5d94f0e6896b5536)
@@ -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
 }