diff --git a/src/angular-local-storage.js b/src/angular-local-storage.js
index c3cf466..76c01fe 100644
--- a/src/angular-local-storage.js
+++ b/src/angular-local-storage.js
@@ -83,7 +83,7 @@ angularLocalStorage.provider('localStorageService', function() {
     }
     var deriveQualifiedKey = function(key) {
       return prefix + key;
-    }
+    };
     // Checks the browser to see if local storage is supported
     var browserSupportsLocalStorage = (function () {
       try {
@@ -386,14 +386,17 @@ angularLocalStorage.provider('localStorageService', function() {
       });
     };
 
-    var lengthToLocalStorage = function() {
-      var cant = 0;
-      for(var iIndex=0; iIndex<localStorage.length; iIndex++){
-        if( localStorage.key(iIndex).contains(prefix) && localStorage.key(iIndex).indexOf(prefix) === 0 ){
-          cant++;
+    // Return localStorageService.length
+    // ignore keys that not owned
+    var lengthOfLocalStorage = function() {
+      var count = 0;
+      var storage = $window[storageType];
+      for(var i = 0; i < storage.length; i++) {
+        if(storage.key(i).indexOf(prefix) === 0 ) {
+          count++;
         }
       }
-      return cant;
+      return count;
     };
 
     return {
@@ -407,7 +410,7 @@ angularLocalStorage.provider('localStorageService', function() {
       clearAll: clearAllFromLocalStorage,
       bind: bindToScope,
       deriveKey: deriveQualifiedKey,
-      length: lengthToLocalStorage,
+      length: lengthOfLocalStorage,
       cookie: {
         set: addToCookies,
         add: addToCookies, //DEPRECATED
diff --git a/test/spec/localStorageSpec.js b/test/spec/localStorageSpec.js
index 1aa066a..8116fd6 100644
--- a/test/spec/localStorageSpec.js
+++ b/test/spec/localStorageSpec.js
@@ -16,6 +16,13 @@ describe('localStorageService', function() {
       },
       removeItem: function(key) {
         delete keys[key];
+      },
+      get length() {
+        return Object.keys(keys).length;
+      },
+      key: function(i) {
+        var aKeys = Object.keys(keys);
+        return aKeys[i] || null;
       }
     };
   }
@@ -264,6 +271,17 @@ describe('localStorageService', function() {
     expect($rootScope.property).toEqual(localStorageService.get('lsProperty'));
   }));
 
+  it('should be able to return it\'s owned keys amount', inject(
+    function(localStorageService, $window) {
+
+      for(var i = 0; i < 10; i++) {
+        localStorageService.set('key' + i, 'val' + i);
+        $window.localStorage.setItem('key' + i, 'val' + i);
+      }
+      expect(localStorageService.length()).toEqual(10);
+      expect($window.localStorage.length).toEqual(20);
+  }));
+
   //sessionStorage
   describe('SessionStorage', function() {