diff --git a/repos/os/include/os/pixel_rgb888.h b/repos/os/include/os/pixel_rgb888.h
index f0101b6139..296b9f6487 100644
--- a/repos/os/include/os/pixel_rgb888.h
+++ b/repos/os/include/os/pixel_rgb888.h
@@ -18,7 +18,7 @@
 
 namespace Genode {
 
-	typedef Pixel_rgba<unsigned long, Surface_base::RGB888,
+	typedef Pixel_rgba<uint32_t, Surface_base::RGB888,
 	                  0xff0000, 16, 0xff00, 8, 0xff, 0, 0, 0>
 	        Pixel_rgb888;