diff --git a/src/video/win32_v.h b/src/video/win32_v.h
--- a/src/video/win32_v.h
+++ b/src/video/win32_v.h
@@ -138,6 +138,8 @@ public:
 
 	bool AfterBlitterChange() override;
 
+	bool HasEfficient8Bpp() const override { return true; }
+
 	const char *GetName() const override { return "win32-opengl"; }
 
 protected: