diff --git a/slider.lua b/slider.lua
index 69da661..2ef7200 100644
--- a/slider.lua
+++ b/slider.lua
@@ -145,7 +145,7 @@ function self.render()
     love.graphics.printf(v.displayname, v.x + margin * 2 - ssize * 6, v.y - 8, ssize * 12, 'center')
 
     if dragging then
-      v.value = ((mx - x) / w) * (v.max - v.min) + v.min
+      v.value = ((mx - (x + 1)) / (w - 2)) * (v.max - v.min) + v.min
       if v.name == 'mix' then graph.touchtimer = 1 end -- sorry !!!
       createUI()
     end