diff --git a/src/Controller/BooktreeController.php b/src/Controller/BooktreeController.php
index 44e5502..30b0e17 100644
--- a/src/Controller/BooktreeController.php
+++ b/src/Controller/BooktreeController.php
@@ -23,11 +23,21 @@ class BooktreeController extends ControllerBase {
     \Drupal::logger('booktree')->debug("Generated content for booktree");
 
 
+    $pos_nid = 2;
+    $pos_depth = 3;
+    $pos_trim_length = 4;
+    $first_segment = $path_args[1];
+    if (strlen($first_segment) == 2 && is_string($first_segment)) {
+      // There is a two letter language prefix in the path.
+      $pos_nid = 3;
+      $pos_depth = 4;
+      $pos_trim = 5;
+    }
 
-    if (isset($path_args[2])) {
-      $booktree_start = $path_args[2];
-      $maxricursione = (isset($path_args[3]))  ? $path_args[3] + 2 : \Drupal::config('booktree.settings')->get('booktree_deep')+2;
-      $trimval = (isset($path_args[4]))  ? $path_args[4]  : 256;
+    if (isset($path_args[$pos_nid])) {
+      $booktree_start = $path_args[$pos_nid];
+      $maxricursione = (isset($path_args[$pos_depth]))  ? $path_args[$pos_depth] + 2 : \Drupal::config('booktree.settings')->get('booktree_deep')+2;
+      $trimval = (isset($path_args[$pos_trim]))  ? $path_args[$pos_trim]  : 256;
     }
     else {
       $booktree_start = \Drupal::config('booktree.settings')->get('booktree_start');