diff --git a/tests/src/Unit/Routing/RoutesTest.php b/tests/src/Unit/Routing/RoutesTest.php
index 5a4396f..67f3c1a 100644
--- a/tests/src/Unit/Routing/RoutesTest.php
+++ b/tests/src/Unit/Routing/RoutesTest.php
@@ -47,6 +47,7 @@ class RoutesTest extends UnitTestCase {
     $type_3->setRelatableResourceTypes([]);
     $resource_type_repository = $this->prophesize(ResourceTypeRepository::class);
     $resource_type_repository->all()->willReturn([$type_1, $type_2, $type_3]);
+    $resource_type_repository->getPathPrefix()->willReturn('jsonapi');
     $container = $this->prophesize(ContainerInterface::class);
     $container->get('jsonapi.resource_type.repository')->willReturn($resource_type_repository->reveal());
     $auth_collector = $this->prophesize(AuthenticationCollectorInterface::class);