--- a/src/render/SDL_render.c	Mon Apr 08 18:37:50 2013 -0400
+++ b/src/render/SDL_render.c	Wed Apr 17 05:10:12 2013 +0400
@@ -161,6 +161,8 @@
             event->motion.y -= renderer->viewport.y;
             event->motion.x = (int)(event->motion.x / renderer->scale.x);
             event->motion.y = (int)(event->motion.y / renderer->scale.y);
+            event->motion.xrel = (int)(event->motion.xrel / renderer->scale.x);
+            event->motion.yrel = (int)(event->motion.yrel / renderer->scale.y);
         }
     } else if (event->type == SDL_MOUSEBUTTONDOWN ||
                event->type == SDL_MOUSEBUTTONUP) {