diff --git a/function.php b/function.php
index 5dec2c7b..942113fb 100644
--- a/function.php
+++ b/function.php
@@ -713,7 +713,7 @@ if (!function_exists('get_file_extension')) {
 			}
 			return $search;
 		} else {
-			return 'application/octet-stream';
+			return 'octet.stream';
 		}
 	}
 }