diff --git a/src/index.js b/src/index.js
index b9b16a8..9b91931 100644
--- a/src/index.js
+++ b/src/index.js
@@ -66,6 +66,7 @@ class MaskedInput extends React.Component {
     this._onKeyDown = this._onKeyDown.bind(this)
     this._onPaste = this._onPaste.bind(this)
     this._onKeyPress = this._onKeyPress.bind(this)
+    this._updateInputSelection = this._updateInputSelection.bind(this)
   }
 
   componentWillMount() {