diff --git a/src/js/mdKeyboard.directive.js b/src/js/mdKeyboard.directive.js
index 650ae17..1f1907c 100755
--- a/src/js/mdKeyboard.directive.js
+++ b/src/js/mdKeyboard.directive.js
@@ -213,6 +213,8 @@ function useKeyboardDirective($mdKeyboard, $timeout, $animate, $rootScope) {
                 _init();
             }
 
+            mdKeyboardController.$inject = ['$scope'];
+
             function _getCaretPosition() {
                 if ('selectionStart' in element) {
                     return element.selectionStart;