Origin: https://gist.github.com/smly/5787574

--- src/xcore_video.c.orig	2003-06-29 15:28:12 UTC
+++ src/xcore_video.c
@@ -307,6 +307,10 @@ static void init_window(void) {
 					   0, WIN_DEPTH,
 					   InputOutput, x11_visual, attrib_mask, &at);
 	}
+	XClassHint wm_class;
+	wm_class.res_name = "XSystem35";
+	wm_class.res_class = "XSystem35";
+	XSetClassHint( x11_display, x11_window, &wm_class );
 	
 	/* determin dib depth candidate */
 	dib_depth_candidate = (depth == 16 && vinfo.red_mask == 0x7c00) ? 15: WIN_DEPTH;