diff --git a/src/window.cpp b/src/window.cpp
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -2751,18 +2751,17 @@ static void HandleAutoscroll()
 	y -= vp->top;
 
 	/* here allows scrolling in both x and y axis */
-#define scrollspeed 3
+	static const int SCROLLSPEED = 3;
 	if (x - 15 < 0) {
-		w->viewport->dest_scrollpos_x += ScaleByZoom((x - 15) * scrollspeed, vp->zoom);
+		w->viewport->dest_scrollpos_x += ScaleByZoom((x - 15) * SCROLLSPEED, vp->zoom);
 	} else if (15 - (vp->width - x) > 0) {
-		w->viewport->dest_scrollpos_x += ScaleByZoom((15 - (vp->width - x)) * scrollspeed, vp->zoom);
+		w->viewport->dest_scrollpos_x += ScaleByZoom((15 - (vp->width - x)) * SCROLLSPEED, vp->zoom);
 	}
 	if (y - 15 < 0) {
-		w->viewport->dest_scrollpos_y += ScaleByZoom((y - 15) * scrollspeed, vp->zoom);
+		w->viewport->dest_scrollpos_y += ScaleByZoom((y - 15) * SCROLLSPEED, vp->zoom);
 	} else if (15 - (vp->height - y) > 0) {
-		w->viewport->dest_scrollpos_y += ScaleByZoom((15 - (vp->height - y)) * scrollspeed, vp->zoom);
+		w->viewport->dest_scrollpos_y += ScaleByZoom((15 - (vp->height - y)) * SCROLLSPEED, vp->zoom);
 	}
-#undef scrollspeed
 }
 
 enum MouseClick {