diff --git a/src/Controls/Slider.ts b/src/Controls/Slider.ts
index 38f9ab35..d7e6d5c0 100644
--- a/src/Controls/Slider.ts
+++ b/src/Controls/Slider.ts
@@ -145,7 +145,7 @@ module Fayde.Controls {
 
             if (max === min)
                 return;
-            var percent = val / (max - min);
+            var percent = (val - min) / (max - min);
             if (largeDecrease != null && thumb != null) {
                 if (isHorizontal)
                     largeDecrease.Width = Math.max(0, percent * (this.ActualWidth - thumb.ActualWidth));
@@ -253,4 +253,4 @@ module Fayde.Controls {
         { Name: "VerticalThumb", Type: Primitives.Thumb },
         { Name: "VerticalTrackLargeChangeIncreaseRepeatButton", Type: Primitives.RepeatButton },
         { Name: "VerticalTrackLargeChangeDecreaseRepeatButton", Type: Primitives.RepeatButton });
-}
\ No newline at end of file
+}