diff --git a/tests/phpunit/includes/spy-rest-server.php b/tests/phpunit/includes/spy-rest-server.php
index 0702ebbb23..49cda8748a 100644
--- a/tests/phpunit/includes/spy-rest-server.php
+++ b/tests/phpunit/includes/spy-rest-server.php
@@ -70,15 +70,15 @@ class Spy_REST_Server extends WP_REST_Server {
 	/**
 	 * Overrides the register_route method so we can re-register routes internally if needed.
 	 *
-	 * @param string $namespace  Namespace.
-	 * @param string $route      The REST route.
-	 * @param array  $route_args Route arguments.
-	 * @param bool   $override   Optional. Whether the route should be overridden if it already exists.
-	 *                           Default false. Also set `$GLOBALS['wp_rest_server']->override_by_default = true`
-	 *                           to set overrides when you don't have access to the caller context.
+	 * @param string $route_namespace Namespace.
+	 * @param string $route           The REST route.
+	 * @param array  $route_args      Route arguments.
+	 * @param bool   $override        Optional. Whether the route should be overridden if it already exists.
+	 *                                Default false. Also set `$GLOBALS['wp_rest_server']->override_by_default = true`
+	 *                                to set overrides when you don't have access to the caller context.
 	 */
-	public function register_route( $namespace, $route, $route_args, $override = false ) {
-		parent::register_route( $namespace, $route, $route_args, $override || $this->override_by_default );
+	public function register_route( $route_namespace, $route, $route_args, $override = false ) {
+		parent::register_route( $route_namespace, $route, $route_args, $override || $this->override_by_default );
 	}
 
 	/**