diff --git a/lib/helper.php b/lib/helper.php
index 84ebcf1d55844d1a22027aa9f327c34a98360d4e..a315c640d1a70c006adb9cb8a5bd6035173c675e 100644
--- a/lib/helper.php
+++ b/lib/helper.php
@@ -377,9 +377,9 @@ class OC_Helper {
 			}
 			$extension=strtolower(strrchr(basename($path), "."));
 			$extension=substr($extension, 1);//remove leading .
-			$mimeType=(isset(self::$mimetypes[$extension]))?self::$mimetypes[$extension]:'application/octet-stream';
+			return (isset(self::$mimetypes[$extension]))?self::$mimetypes[$extension]:'application/octet-stream';
 		}else{
-			$mimeType='application/octet-stream';
+			return 'application/octet-stream';
 		}
 	}