diff --git a/system/core/Common.php b/system/core/Common.php
index 8b74db0..f7bd426 100644
--- a/system/core/Common.php
+++ b/system/core/Common.php
@@ -319,12 +319,9 @@
 
 		if (empty($_mimes))
 		{
-			$_mimes = array();
-
-			if (file_exists(APPPATH.'config/mimes.php'))
-			{
-				$_mimes = array_merge($_mimes, include(APPPATH.'config/mimes.php'));
-			}
+			$_mimes = file_exists(APPPATH.'config/mimes.php')
+				? include(APPPATH.'config/mimes.php')
+				: array();
 
 			if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
 			{