diff --git a/src/Providers/AbstractServiceProvider.php b/src/Providers/AbstractServiceProvider.php
index 9834740b7..2216d797e 100644
--- a/src/Providers/AbstractServiceProvider.php
+++ b/src/Providers/AbstractServiceProvider.php
@@ -318,7 +318,7 @@ protected function getConfigInstance($key)
         $instance = $this->config($key);
 
         if (is_string($instance)) {
-            return new $instance;
+            return $this->app->make($instance);
         }
 
         return $instance;