Index: uspace/lib/c/include/io/charfield.h
===================================================================
--- uspace/lib/c/include/io/charfield.h	(revision 3bacee1839e6f355100ab4ea86bb211e9ecf19ed)
+++ uspace/lib/c/include/io/charfield.h	(revision bc73be3215c832cdb0c8a5022db800902f9f62dc)
@@ -34,6 +34,6 @@
  */
 
-#ifndef LIBC_IO_CHARFIELD_H_
-#define LIBC_IO_CHARFIELD_H_
+#ifndef _LIBC_IO_CHARFIELD_H_
+#define _LIBC_IO_CHARFIELD_H_
 
 #include <stdbool.h>