diff --git a/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php b/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php
index d978ac1..f9c00a4 100644
--- a/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php
+++ b/src/Pecee/SimpleRouter/ClassLoader/IClassLoader.php
@@ -7,6 +7,6 @@ interface IClassLoader
 
     public function loadClass(string $class);
 
-    public function loadClosure(\Closure $closure, array $parameters);
+    public function loadClosure(Callable $closure, array $parameters);
 
-}
\ No newline at end of file
+}