diff bbd168f542014bce6706515654e5a80bc4101566 uncommitted
--- a/g_game.c
+++ b/g_game.c
@@ -778,8 +778,8 @@
 		mousebuttons[0] = ev->data1 & 1;
 		mousebuttons[1] = ev->data1 & 2;
 		mousebuttons[2] = ev->data1 & 4;
-		mousex = ev->data2 * (mouseSensitivity + 5) / 2;
-		mousey = ev->data3 * (mouseSensitivity + 5) / 2;
+		mousex += ev->data2 * (mouseSensitivity + 5) / 2;
+		mousey += ev->data3 * (mouseSensitivity + 5) / 2;
 		return true;	// eat events
 
 	case ev_joystick: