diff --git a/src/blitter/null.hpp b/src/blitter/null.hpp
--- a/src/blitter/null.hpp
+++ b/src/blitter/null.hpp
@@ -23,7 +23,6 @@ public:
 	/* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);
 	/* virtual */ void *MoveTo(const void *video, int x, int y) { return NULL; };
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 colour) {};
-	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 colour) {};
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 colour) {};
 	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour) {};
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height) {};