diff --git a/ares/bitncmp.h b/ares/bitncmp.h
index b527e10ce..6d15123d2 100644
--- a/ares/bitncmp.h
+++ b/ares/bitncmp.h
@@ -1,3 +1,6 @@
+#ifndef __ARES_BITNCMP_H
+#define __ARES_BITNCMP_H
+
 /* $Id$ */
 
 /*
@@ -14,13 +17,10 @@
  * without express or implied warranty.
  */
 
-#ifndef BITNCMP_H
-#define BITNCMP_H
-
 #ifndef HAVE_BITNCMP
 int ares_bitncmp(const void *l, const void *r, int n);
 #else
 #define ares_bitncmp(x,y,z) bitncmp(x,y,z)
 #endif
 
-#endif /* BITNCMP_H */
+#endif /* __ARES_BITNCMP_H */