diff --git a/gtk/src/gtk_display_driver_opengl.h b/gtk/src/gtk_display_driver_opengl.h
index be295a37..8c91deaf 100644
--- a/gtk/src/gtk_display_driver_opengl.h
+++ b/gtk/src/gtk_display_driver_opengl.h
@@ -24,7 +24,7 @@
 
 #include "shaders/glsl.h"
 
-#define BUFFER_OFFSET(i) ((char *) NULL + (i))
+#define BUFFER_OFFSET(i) ((char *) (i))
 
 class S9xOpenGLDisplayDriver : public S9xDisplayDriver
 {