diff --git a/src/test/java/org/jenkinsci/plugins/workflow/DirectArtifactManagerFactory.java b/src/test/java/org/jenkinsci/plugins/workflow/DirectArtifactManagerFactory.java
index 00fedd9b..f02bac99 100644
--- a/src/test/java/org/jenkinsci/plugins/workflow/DirectArtifactManagerFactory.java
+++ b/src/test/java/org/jenkinsci/plugins/workflow/DirectArtifactManagerFactory.java
@@ -102,7 +102,7 @@ public DirectArtifactManagerFactory() throws Exception {
             }).
             create();
         server.start();
-        baseURL = new URL("http://" + server.getInetAddress().getHostName() + ":" + server.getLocalPort() + "/");
+        baseURL = new URL("http", server.getInetAddress().getHostName(), server.getLocalPort(), "/");
         LOGGER.log(Level.INFO, "Mock server running at {0}", baseURL);
 
     }