3 files changed, 12 insertions, 6 deletions
diff --git a/db/db.h b/db/db.h
index 8f1a9de..f00c4df 100644
--- a/db/db.h
+++ b/db/db.h
@@ -33,8 +33,8 @@
  *	@(#)db.h	8.7 (Berkeley) 6/16/94
  */
 
-#ifndef _DB_H_
-#define	_DB_H_
+#ifndef _DB_H
+#define	_DB_H 1
 
 #include <sys/types.h>
 #include <sys/cdefs.h>
@@ -234,4 +234,5 @@ DB	*__rec_open __P((const char *, int, int, const RECNOINFO *, int));
 void	 __dbpanic __P((DB *dbp));
 #endif
 __END_DECLS
-#endif /* !_DB_H_ */
+
+#endif /* db.h */
diff --git a/db/mpool.h b/db/mpool.h
index e533072..56f17f9 100644
--- a/db/mpool.h
+++ b/db/mpool.h
@@ -33,6 +33,9 @@
  *	@(#)mpool.h	8.2 (Berkeley) 7/14/94
  */
 
+#ifndef _MPOOL_H
+#define _MPOOL_H 1
+
 #include <sys/queue.h>
 
 /*
@@ -105,3 +108,5 @@ int	 mpool_close __P((MPOOL *));
 void	 mpool_stat __P((MPOOL *));
 #endif
 __END_DECLS
+
+#endif /* mpool.h */
diff --git a/db/ndbm.h b/db/ndbm.h
index 48c4083..db14dff 100644
--- a/db/ndbm.h
+++ b/db/ndbm.h
@@ -36,8 +36,8 @@
  *	@(#)ndbm.h	8.1 (Berkeley) 6/2/93
  */
 
-#ifndef _NDBM_H_
-#define	_NDBM_H_
+#ifndef _NDBM_H
+#define	_NDBM_H 1
 
 #include <db.h>
 
@@ -76,4 +76,4 @@ int	 dbm_error __P((DBM *));
 int	 dbm_clearerr __P((DBM *));
 __END_DECLS
 
-#endif /* !_NDBM_H_ */
+#endif /* ndbm.h */