diff --git a/system/config.php b/system/config.php
index 7580a821..613afc25 100644
--- a/system/config.php
+++ b/system/config.php
@@ -68,7 +68,7 @@ public static function set($key, $value)
 			throw new \Exception("Error setting configuration option. Option [$key] is not defined.");
 		}
 
-		(is_null($key)) ? static::$items[$module][$file] = $value : static::$items[$module][$file][$key] = $value;
+		(is_null($key)) ? static::$items[$module][$file] = $value : Arr::set(static::$items[$module][$file], $key, $value);
 	}
 
 	/**