Index: uspace/lib/c/generic/fibril_synch.c
===================================================================
--- uspace/lib/c/generic/fibril_synch.c	(revision 47b70062180b321b58ca43746901c748ff7a6b2d)
+++ uspace/lib/c/generic/fibril_synch.c	(revision 6bfaab552b3539dda0ec53d173564bce19472b6b)
@@ -43,4 +43,5 @@
 #include <stacktrace.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include "private/async.h"