diff --git a/README.md b/README.md
index 3db3883..3c9ba4b 100644
--- a/README.md
+++ b/README.md
@@ -125,10 +125,6 @@ The number of pixels the content width can surpass the container width without e
 The number of pixels the content height can surpass the container height without enabling the Y axis scroll bar. Allows some "wiggle room" or "offset break", so that Y axis scroll bar is not enabled just because of a few pixels.  
 **Default: 0**
 
-### includePadding
-When set to true, it uses `innerWidth` and `innerHeight` for the container size instead of `width` and `height`. When your container element has non-zero padding and the scrollbar layout looks weird, this option can be helpful.  
-**Default: false**
-
 How to Use
 ----------
 
diff --git a/src/js/plugin/default-setting.js b/src/js/plugin/default-setting.js
index 06bdc1c..4e2b174 100644
--- a/src/js/plugin/default-setting.js
+++ b/src/js/plugin/default-setting.js
@@ -15,5 +15,4 @@ module.exports = {
   suppressScrollY: false,
   scrollXMarginOffset: 0,
   scrollYMarginOffset: 0,
-  includePadding: false
 };
diff --git a/src/js/plugin/ps.js b/src/js/plugin/ps.js
index fede174..84e0081 100644
--- a/src/js/plugin/ps.js
+++ b/src/js/plugin/ps.js
@@ -159,8 +159,8 @@ module.exports = function (element, settingOrCommand) {
     cls.remove(element, 'ps-active-x');
     cls.remove(element, 'ps-active-y');
 
-    containerWidth = settings.includePadding ? element.clientWidth : h.toInt(d.css(element, 'width'));
-    containerHeight = settings.includePadding ? element.clientHeight : h.toInt(d.css(element, 'height'));
+    containerWidth = element.clientWidth;
+    containerHeight = element.clientHeight;
     contentWidth = element.scrollWidth;
     contentHeight = element.scrollHeight;