diff --git a/js/ui/slider.js b/js/ui/slider.js
index 383dca413..8844d9abd 100644
--- a/js/ui/slider.js
+++ b/js/ui/slider.js
@@ -197,7 +197,7 @@ const Slider = new Lang.Class({
             let [dx, dy] = event.get_scroll_delta();
             // Even though the slider is horizontal, use dy to match
             // the UP/DOWN above.
-            delta = -dy / 10;
+            delta = -dy * SLIDER_SCROLL_STEP;
         }
 
         this._value = Math.min(Math.max(0, this._value + delta), 1);