diff --git a/src/Pecee/SimpleRouter/Route/IGroupRoute.php b/src/Pecee/SimpleRouter/Route/IGroupRoute.php
index 1f41c27..e3be5d2 100644
--- a/src/Pecee/SimpleRouter/Route/IGroupRoute.php
+++ b/src/Pecee/SimpleRouter/Route/IGroupRoute.php
@@ -59,7 +59,7 @@ interface IGroupRoute extends IRoute
      * @param string $url
      * @return static
      */
-    public function prependUrl(string $url): self;
+    public function prependPrefix(string $url): self;
 
     /**
      * Set prefix that child-routes will inherit.
diff --git a/src/Pecee/SimpleRouter/Route/RouteGroup.php b/src/Pecee/SimpleRouter/Route/RouteGroup.php
index 714a9a9..465c171 100644
--- a/src/Pecee/SimpleRouter/Route/RouteGroup.php
+++ b/src/Pecee/SimpleRouter/Route/RouteGroup.php
@@ -159,7 +159,7 @@ class RouteGroup extends Route implements IGroupRoute
      * @param string $url
      * @return static
      */
-    public function prependUrl(string $url): IGroupRoute
+    public function prependPrefix(string $url): IGroupRoute
     {
         return $this->setPrefix(rtrim($url, '/') . $this->prefix);
     }
diff --git a/tests/Pecee/SimpleRouter/EventHandlerTest.php b/tests/Pecee/SimpleRouter/EventHandlerTest.php
index ec170c8..2473740 100644
--- a/tests/Pecee/SimpleRouter/EventHandlerTest.php
+++ b/tests/Pecee/SimpleRouter/EventHandlerTest.php
@@ -110,9 +110,6 @@ class EventHandlerTest extends \PHPUnit\Framework\TestCase
         $eventHandler = new EventHandler();
         $eventHandler->register(EventHandler::EVENT_ADD_ROUTE, function(EventArgument $data) use($basePath) {
 
-            // Add basepath
-            $basePath = rtrim($basePath, '/');
-
             // Skip routes added by group
             if($data->isSubRoute === false) {
 
@@ -121,7 +118,7 @@ class EventHandlerTest extends \PHPUnit\Framework\TestCase
                         $data->route->prependUrl($basePath);
                         break;
                     case $data->route instanceof \Pecee\SimpleRouter\Route\IGroupRoute:
-                        $data->route->setPrefix($basePath . $data->route->getPrefix());
+                        $data->route->prependPrefix($basePath);
                         break;
 
                 }