diff --git a/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php b/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
index caea1a5..c73c7a8 100644
--- a/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
+++ b/src/Pecee/SimpleRouter/ClassLoader/ClassLoader.php
@@ -53,7 +53,7 @@ class ClassLoader implements IClassLoader
      * @return mixed
      * @throws NotFoundHttpException
      */
-    public function loadClosure(\Closure $closure, array $parameters)
+    public function loadClosure(Callable $closure, array $parameters)
     {
         if ($this->useDependencyInjection === true) {
             $container = $this->getContainer();
@@ -115,4 +115,4 @@ class ClassLoader implements IClassLoader
         return $this->useDependencyInjection;
     }
 
-}
\ No newline at end of file
+}
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
+}