diff --git a/phpBB/phpbb/mimetype/content_guesser.php b/phpBB/phpbb/mimetype/content_guesser.php
index 623438ee0b..60e5a905e2 100644
--- a/phpBB/phpbb/mimetype/content_guesser.php
+++ b/phpBB/phpbb/mimetype/content_guesser.php
@@ -32,7 +32,5 @@ class content_guesser extends guesser_base
 		{
 			return mime_content_type($file);
 		}
-
-		return null; // optional
 	}
 }