diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
index c0b68a2d17a46..e8cd23f96649d 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
@@ -86,7 +86,7 @@ public function warmUp($cacheDir)
      */
     private function resolveParameters(RouteCollection $collection)
     {
-        foreach ($collection as $route) {
+        foreach ($collection as $routeName => $route) {
             foreach ($route->getDefaults() as $name => $value) {
                 $route->setDefault($name, $this->resolve($value));
             }
@@ -97,6 +97,18 @@ private function resolveParameters(RouteCollection $collection)
                 }
 
                 $route->setRequirement($name, $this->resolve($value));
+                $default = $route->getDefault($name);
+                $requirement = $route->getRequirement($name);
+
+                if (null !== $default && 1 !== preg_match('#'.$requirement.'#', $default)) {
+                    throw new RuntimeException(sprintf(
+                        'Default value "%s" for "%s" does not match requirement "%s" in "%s" route.',
+                        $default,
+                        $name,
+                        $requirement,
+                        $routeName
+                    ));
+                }
             }
 
             $route->setPath($this->resolve($route->getPath()));
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php
index 330e0659ca144..9c248b567b2c1 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php
@@ -185,13 +185,29 @@ public function testExceptionOnNonStringParameter()
         $router->getRouteCollection()->get('foo');
     }
 
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
+     * @expectedExceptionMessage Default value "baz" for "bar" does not match requirement "\d+" in "foo" route.
+     */
+    public function testExceptionOnDefaultValueNotMatchingRequirement()
+    {
+        $routes = new RouteCollection();
+        $routes->add('foo', new Route('foo', array('bar' => 'baz'), array('bar' => '\d+')));
+
+        $sc = $this->getServiceContainer($routes);
+
+        $router = new Router($sc, 'foo');
+
+        $route = $router->getRouteCollection()->get('foo');
+    }
+
     /**
      * @dataProvider getNonStringValues
      */
     public function testDefaultValuesAsNonStrings($value)
     {
         $routes = new RouteCollection();
-        $routes->add('foo', new Route('foo', array('foo' => $value), array('foo' => '\d+')));
+        $routes->add('foo', new Route('foo', array('foo' => $value)));
 
         $sc = $this->getServiceContainer($routes);