Index: uspace/lib/c/include/ipc/serial_ctl.h
===================================================================
--- uspace/lib/c/include/ipc/serial_ctl.h	(revision 74017cef2e4edaf9405cf38ba4b0958f664e700c)
+++ uspace/lib/c/include/ipc/serial_ctl.h	(revision 1995ac3eb9bf37f3e753f79bcf6dba1a3c3df86e)
@@ -27,6 +27,6 @@
  */
 
-#ifndef LIBC_IPC_SERIAL_CTL_H_
-#define LIBC_IPC_SERIAL_CTL_H_
+#ifndef _LIBC_IPC_SERIAL_CTL_H_
+#define _LIBC_IPC_SERIAL_CTL_H_
 
 #include <ipc/chardev.h>