Index: uspace/lib/c/include/align.h
===================================================================
--- uspace/lib/c/include/align.h	(revision 09ab0a9afc9379f1604c0fd75cac2d9287ba022c)
+++ uspace/lib/c/include/align.h	(revision 04c0fc5aa45ec90f84d2ef0b8b067f698c6f5f0e)
@@ -33,6 +33,6 @@
  */
 
-#ifndef LIBC_ALIGN_H_
-#define LIBC_ALIGN_H_
+#ifndef _LIBC_ALIGN_H_
+#define _LIBC_ALIGN_H_
 
 /** Align to the nearest lower address which is a power of two.