--- checkout.module.orig	2008-08-06 15:00:46.000000000 +0200
+++ checkout.module     2008-08-06 15:00:54.000000000 +0200
@@ -248,10 +248,11 @@
 
   if (!isset($regexp)) {
     $patterns = variable_get('checkout_edit_paths', "edit\nrevisions\nrevisions/*\noutline\nclassify");
-    $regexp = '@^node/(\d+)/(?:'. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/'), array('|', '.*'), preg_quote($patterns, '@')) .')$@';
+    // Remove possible language prefix before node/ to get nids from a path like 'en/node/138/edit'.
+    $regexp = '@^([^/]*/)?node/(\d+)/(?:'. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/'), array('|', '.*'), preg_quote($patterns, '@')) .')$@';
   }
   if (preg_match($regexp, $path, $match)) {
-    return $match[1];
+    return $match[2];
   }
   return FALSE;
 }