diff --git a/src/js/lib/helper.js b/src/js/lib/helper.js
index 648698f..2e12338 100644
--- a/src/js/lib/helper.js
+++ b/src/js/lib/helper.js
@@ -53,6 +53,14 @@ exports.removePsClasses = function (element) {
   }
 };
 
+exports.outerWidth = function (element) {
+  return this.toInt(d.css(element, 'width')) +
+         this.toInt(d.css(element, 'paddingLeft')) +
+         this.toInt(d.css(element, 'paddingRight')) +
+         this.toInt(d.css(element, 'borderLeftWidth')) +
+         this.toInt(d.css(element, 'borderRightWidth'));
+};
+
 exports.env = {
   isWebKit: 'WebkitAppearance' in document.documentElement.style,
   supportsTouch: (('ontouchstart' in window) || window.DocumentTouch && document instanceof window.DocumentTouch),
diff --git a/src/js/plugin/instances.js b/src/js/plugin/instances.js
index 87b4cb9..e0d4b79 100644
--- a/src/js/plugin/instances.js
+++ b/src/js/plugin/instances.js
@@ -44,6 +44,7 @@ function Instance(element) {
   i.scrollbarYRight = h.toInt(d.css(i.scrollbarYRail, 'right'));
   i.isScrollbarYUsingRight = i.scrollbarYRight === i.scrollbarYRight; // !isNaN
   i.scrollbarYLeft = i.isScrollbarYUsingRight ? null : h.toInt(d.css(i.scrollbarYRail, 'left'));
+  i.scrollbarYOuterWidth = i.isRtl ? h.outerWidth(i.scrollbarY) : null;
   i.railBorderYWidth = h.toInt(d.css(i.scrollbarYRail, 'borderTopWidth')) + h.toInt(d.css(i.scrollbarYRail, 'borderBottomWidth'));
   i.railYMarginHeight = h.toInt(d.css(i.scrollbarYRail, 'marginTop')) + h.toInt(d.css(i.scrollbarYRail, 'marginBottom'));
   i.railYHeight = null;
diff --git a/src/js/plugin/update.js b/src/js/plugin/update.js
index ba902dc..b1dd110 100644
--- a/src/js/plugin/update.js
+++ b/src/js/plugin/update.js
@@ -32,22 +32,21 @@ function updateCss(element, i) {
   }
   d.css(i.scrollbarXRail, xRailOffset);
 
-  var railYOffset = {top: element.scrollTop, height: i.railYHeight};
-
+  var yRailOffset = {top: element.scrollTop, height: i.railYHeight};
   if (i.isScrollbarYUsingRight) {
     if (i.isRtl) {
-      railYOffset.right = i.contentWidth - element.scrollLeft - i.scrollbarYRight - i.scrollbarY.offsetWidth;
+      yRailOffset.right = i.contentWidth - element.scrollLeft - i.scrollbarYRight - i.scrollbarYOuterWidth;
     } else {
-      railYOffset.right = i.scrollbarYRight - element.scrollLeft;
+      yRailOffset.right = i.scrollbarYRight - element.scrollLeft;
     }
   } else {
     if (i.isRtl) {
-      railYOffset.left = element.scrollLeft + i.containerWidth * 2 - i.contentWidth - i.scrollbarYLeft - i.scrollbarY.offsetWidth;
+      yRailOffset.left = element.scrollLeft + i.containerWidth * 2 - i.contentWidth - i.scrollbarYLeft - i.scrollbarYOuterWidth;
     } else {
-      railYOffset.left = i.scrollbarYLeft + element.scrollLeft;
+      yRailOffset.left = i.scrollbarYLeft + element.scrollLeft;
     }
   }
-  d.css(i.scrollbarYRail, railYOffset);
+  d.css(i.scrollbarYRail, yRailOffset);
 
   d.css(i.scrollbarX, {left: i.scrollbarXLeft, width: i.scrollbarXWidth - i.railBorderXWidth});
   d.css(i.scrollbarY, {top: i.scrollbarYTop, height: i.scrollbarYHeight - i.railBorderYWidth});