diff --git a/RouteDescriber/RouteMetadataDescriber.php b/RouteDescriber/RouteMetadataDescriber.php
index 5d0feed..6f3a674 100644
--- a/RouteDescriber/RouteMetadataDescriber.php
+++ b/RouteDescriber/RouteMetadataDescriber.php
@@ -26,8 +26,12 @@ final class RouteMetadataDescriber implements RouteDescriberInterface
             $requirements = $route->getRequirements();
             $compiledRoute = $route->compile();
 
-            // Don't include path variables
+            // Don't include host requirements
             foreach ($compiledRoute->getPathVariables() as $pathVariable) {
+                if ('_format' === $pathVariable) {
+                    continue;
+                }
+
                 $parameter = $operation->getParameters()->get($pathVariable, 'path');
                 $parameter->setRequired(true);
                 $parameter->setType('string');
diff --git a/Tests/Functional/FunctionalTest.php b/Tests/Functional/FunctionalTest.php
index 2cbae54..25a0c0e 100644
--- a/Tests/Functional/FunctionalTest.php
+++ b/Tests/Functional/FunctionalTest.php
@@ -47,6 +47,9 @@ class FunctionalTest extends WebTestCase
         $parameters = $operation->getParameters();
         $this->assertTrue($parameters->has('foo', 'query'));
         $this->assertTrue($parameters->has('bar', 'formData'));
+
+        // The _format path attribute should be removed
+        $this->assertFalse($parameters->has('_format', 'path'));
     }
 
     public function testNelmioAction()