Index: uspace/lib/c/include/fibril_synch.h
===================================================================
--- uspace/lib/c/include/fibril_synch.h	(revision 3446eadd2d23b367118bdbfaeba35489b10042fb)
+++ uspace/lib/c/include/fibril_synch.h	(revision 401415aa8fcb6902c643bf1c028f08be8f7c2d8e)
@@ -33,6 +33,6 @@
  */
 
-#ifndef LIBC_FIBRIL_SYNCH_H_
-#define LIBC_FIBRIL_SYNCH_H_
+#ifndef _LIBC_FIBRIL_SYNCH_H_
+#define _LIBC_FIBRIL_SYNCH_H_
 
 #include <fibril.h>