diff --git a/engine/router.php b/engine/router.php
index f29dffd..4baaa2c 100644
--- a/engine/router.php
+++ b/engine/router.php
@@ -2,6 +2,9 @@
 
 class router {
 
+    const int ROUTER_VERSION = 10;
+    const string ROUTER_MC_KEY = '4in1/routes';
+
     protected array $routes = [
         'children' => [],
         're_children' => []
@@ -21,9 +24,9 @@ class router {
         $write_cache = !isDev();
 
         if ($from_cache) {
-            $cache = $mc->get(ROUTER_MC_KEY);
+            $cache = $mc->get(self::ROUTER_MC_KEY);
 
-            if ($cache === false || !isset($cache['version']) || $cache['version'] < ROUTER_VERSION) {
+            if ($cache === false || !isset($cache['version']) || $cache['version'] < self::ROUTER_VERSION) {
                 $from_cache = false;
             } else {
                 $this->routes = $cache['routes'];
@@ -39,7 +42,7 @@ class router {
             }
 
             if ($write_cache)
-                $mc->set(ROUTER_MC_KEY, ['version' => ROUTER_VERSION, 'routes' => $this->routes]);
+                $mc->set(self::ROUTER_MC_KEY, ['version' => self::ROUTER_VERSION, 'routes' => $this->routes]);
         }
     }
 
diff --git a/routes.php b/routes.php
index 656b5d6..c4ae38c 100644
--- a/routes.php
+++ b/routes.php
@@ -1,8 +1,5 @@
 <?php
 
-const ROUTER_VERSION = 10;
-const ROUTER_MC_KEY = '4in1/routes';
-
 return (function() {
     global $config;