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-rw-r--r--db/mpool.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/db/mpool.h b/db/mpool.h
index e533072a65..56f17f90db 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 */