diff --git a/libs/video/targets/in_x11.c b/libs/video/targets/in_x11.c
index 40bd1e0ef..5395ea639 100644
--- a/libs/video/targets/in_x11.c
+++ b/libs/video/targets/in_x11.c
@@ -801,8 +801,10 @@ event_motion (XEvent *event)
 	} else {
 		if (vid_fullscreen->int_val || input_grabbed) {
 			if (!event->xmotion.send_event) {
-				unsigned    dist_x = abs (viddef.width / 2 - event->xmotion.x);
-				unsigned    dist_y = abs (viddef.height / 2 - event->xmotion.y);
+				int         center_x = viddef.width / 2;
+				int         center_y = viddef.height / 2;
+				unsigned    dist_x = abs (center_x / 2 - event->xmotion.x);
+				unsigned    dist_y = abs (center_y / 2 - event->xmotion.y);
 
 				x11_mouse_axes[0].value = event->xmotion.x - x11_mouse.x;
 				x11_mouse_axes[1].value = event->xmotion.y - x11_mouse.y;