diff --git a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
index d7a2a9efba..6bf41517ac 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
@@ -140,6 +140,14 @@ class TimeType extends AbstractType
 
         if ('single_text' === $options['widget']) {
             $view->vars['type'] = 'time';
+
+            // we need to force the browser to display the seconds by
+            // adding the HTML attribute step if not already defined.
+            // Otherwise the browser will not display and so not send the seconds
+            // therefore the value will always be considered as invalid.
+            if ($options['with_seconds'] && !isset($view->vars['attr']['step'])) {
+                $view->vars['attr']['step'] = 1;
+            }
         }
     }
 
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
index 9bdfe1567b..ca186207ac 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
@@ -492,6 +492,33 @@ class TimeTypeTest extends TypeTestCase
         $this->assertEquals('time', $view->vars['type']);
     }
 
+    public function testSingleTextWidgetWithSecondsShouldHaveRightStepAttribute()
+    {
+        $form = $this->factory->create('time', null, array(
+            'widget' => 'single_text',
+            'with_seconds' => true,
+        ));
+
+        $view = $form->createView();
+        $this->assertArrayHasKey('step', $view->vars['attr']);
+        $this->assertEquals(1, $view->vars['attr']['step']);
+    }
+
+    public function testSingleTextWidgetWithSecondsShouldNotOverrideStepAttribute()
+    {
+        $form = $this->factory->create('time', null, array(
+            'widget' => 'single_text',
+            'with_seconds' => true,
+            'attr' => array(
+                'step' => 30
+            )
+        ));
+
+        $view = $form->createView();
+        $this->assertArrayHasKey('step', $view->vars['attr']);
+        $this->assertEquals(30, $view->vars['attr']['step']);
+    }
+
     public function testPassDefaultEmptyValueToViewIfNotRequired()
     {
         $form = $this->factory->create('time', null, array(