diff --git a/src/osd/windows/drawdd.c b/src/osd/windows/drawdd.c
index 5616f243c02..8cc2c091adf 100644
--- a/src/osd/windows/drawdd.c
+++ b/src/osd/windows/drawdd.c
@@ -58,7 +58,7 @@ public:
 		//ddcaps(0),
 		//helcaps(0),
 		membuffer(NULL),
-		membuffersize(NULL)
+		membuffersize(0)
 	{ }
 
 	virtual ~renderer_dd() { }