diff --git a/testing/geckodriver/src/main.rs b/testing/geckodriver/src/main.rs
index b70c340006df..17f4ed9f7c11 100644
--- a/testing/geckodriver/src/main.rs
+++ b/testing/geckodriver/src/main.rs
@@ -156,7 +156,7 @@ You can obtain a copy of the license at https://mozilla.org/MPL/2.0/.");
     };
 
     let handler = MarionetteHandler::new(settings);
-    let listening = try!(webdriver::server::start(addr, handler, &extension_routes())
+    let listening = try!(webdriver::server::start(addr, handler, &extension_routes()[..])
         .map_err(|err| (ExitCode::Unavailable, err.to_string())));
     info!("Listening on {}", listening.socket);
     Ok(())