diff --git a/src/Klein/Klein.php b/src/Klein/Klein.php
index 587379fd..906bcb2c 100644
--- a/src/Klein/Klein.php
+++ b/src/Klein/Klein.php
@@ -392,7 +392,7 @@ public function with($namespace, $routes)
             } else {
                 call_user_func($routes, $this);
             }
-        } else {
+        } elseif (file_exists($routes)) {
             require $routes;
         }