diff --git a/src/dlangui/platforms/x11/x11app.d b/src/dlangui/platforms/x11/x11app.d
index 01546356..664866f2 100644
--- a/src/dlangui/platforms/x11/x11app.d
+++ b/src/dlangui/platforms/x11/x11app.d
@@ -250,7 +250,7 @@ class X11Window : DWindow {
 		_flags = flags;
 
 		/* get the colors black and white (see section for details) */
-		ulong black, white;
+		uint black, white;
 		black = BlackPixel(x11display, x11screen);	/* get color black */
 		white = WhitePixel(x11display, x11screen);  /* get color white */