Index: uspace/lib/c/include/ipc/ipc.h
===================================================================
--- uspace/lib/c/include/ipc/ipc.h	(revision d054ad327ffe0b12fea2dcc17f0711048959b7b2)
+++ uspace/lib/c/include/ipc/ipc.h	(revision 8add15e0d742e2ce9688f92ee8e6378e2caa7b04)
@@ -33,10 +33,10 @@
  */
 
-#if ((defined(LIBC_ASYNC_H_)) && (!defined(LIBC_ASYNC_C_)))
+#if ((defined(_LIBC_ASYNC_H_)) && (!defined(_LIBC_ASYNC_C_)))
 #error Do not intermix low-level IPC interface and async framework
 #endif
 
-#ifndef LIBC_IPC_H_
-#define LIBC_IPC_H_
+#ifndef _LIBC_IPC_H_
+#define _LIBC_IPC_H_
 
 #include <ipc/common.h>