diff --git a/src/directive/input.js b/src/directive/input.js
index 631e3a367d2a..2e1c7ffff7f2 100644
--- a/src/directive/input.js
+++ b/src/directive/input.js
@@ -800,22 +800,21 @@ var NgModelController = ['$scope', '$exceptionHandler', '$attrs', 'ngModel', '$e
 
     if (isValid) {
       if ($error[validationErrorKey]) invalidCount--;
-      $error[validationErrorKey] = false;
-      toggleValidCss(isValid);
       if (!invalidCount) {
-        toggleValidCss(isValid, validationErrorKey);
+        toggleValidCss(true);
         this.$valid = true;
         this.$invalid = false;
       }
     } else {
-      if (!$error[validationErrorKey]) invalidCount++;
-      $error[validationErrorKey] = true;
-      toggleValidCss(isValid)
-      toggleValidCss(isValid, validationErrorKey);
+      toggleValidCss(false)
       this.$invalid = true;
       this.$valid = false;
+      invalidCount++;
     }
 
+    $error[validationErrorKey] = !isValid;
+    toggleValidCss(isValid, validationErrorKey);
+
     parentForm.$setValidity(validationErrorKey, isValid, this);
   };
 
diff --git a/test/directive/inputSpec.js b/test/directive/inputSpec.js
index ad1670f9f1b2..2a7244c9f68f 100644
--- a/test/directive/inputSpec.js
+++ b/test/directive/inputSpec.js
@@ -269,6 +269,15 @@ describe('ng-model', function() {
 
     dealoc(element);
   }));
+
+
+  it('should set invalid classes on init', inject(function($compile, $rootScope) {
+    var element = $compile('<input type="email" ng-model="value" required />')($rootScope);
+    $rootScope.$digest();
+
+    expect(element).toBeInvalid();
+    expect(element).toHaveClass('ng-invalid-required');
+  }));
 });