src/include/refcount_ptr.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/include/refcount_ptr.h b/src/include/refcount_ptr.h
index 4645769..ebabd58 100644
--- a/src/include/refcount_ptr.h
+++ b/src/include/refcount_ptr.h
@@ -1,6 +1,8 @@
 #ifndef	REFCOUNT_PTR_H
 #define	REFCOUNT_PTR_H
 
+#include <stddef.h>
+
 /*
  *  Copyright (C) 2007-2010  Anders Gavare.  All rights reserved.
  *