diff --git a/tileserver.php b/tileserver.php
index 6fa706b..3413256 100644
--- a/tileserver.php
+++ b/tileserver.php
@@ -15,17 +15,17 @@ Router::serve(array(
     '/' => 'Server:getHtml',
     '/test' => 'Server:getInfo',
     '/html' => 'Server:getHtml',
-    '/:string.json' => 'Json:getJson',
-    '/:string.jsonp' => 'Json:getJsonp',
-    '/:string/:number/:number/:number.:string.json' => 'Json:getUTFGrid',
+    '/:alpha.json' => 'Json:getJson',
+    '/:alpha.jsonp' => 'Json:getJsonp',
+    '/:alpha/:number/:number/:number.:alpha.json' => 'Json:getUTFGrid',
     '/wmts' => 'Wmts:get',
     '/wmts/1.0.0/WMTSCapabilities.xml' => 'Wmts:get',
-    '/wmts/:string/:number/:number/:number.:string' => 'Wmts:getTile',
-    '/wmts/:string/:string/:number/:number/:number.:string' => 'Wmts:getTile',
-    '/wmts/:string/:string/:string/:number/:number/:number.:string' => 'Wmts:getTile',
-    '/:string/:number/:number/:number.:string' => 'Wmts:getTile',
+    '/wmts/:alpha/:number/:number/:number.:alpha' => 'Wmts:getTile',
+    '/wmts/:alpha/:alpha/:number/:number/:number.:alpha' => 'Wmts:getTile',
+    '/wmts/:alpha/:alpha/:alpha/:number/:number/:number.:alpha' => 'Wmts:getTile',
+    '/:alpha/:number/:number/:number.:alpha' => 'Wmts:getTile',
     '/tms' => 'Tms:getCapabilities',
-    '/tms/:string' => 'Tms:getLayerCapabilities',
+    '/tms/:alpha' => 'Tms:getLayerCapabilities',
 ));
 
 /**