diff --git a/src/cowboy_req.erl b/src/cowboy_req.erl
index 981b3219..27c59cf7 100644
--- a/src/cowboy_req.erl
+++ b/src/cowboy_req.erl
@@ -56,6 +56,7 @@
 
 %% Multipart API.
 -export([part/1]).
+-export([part/2]).
 -export([part_body/1]).
 -export([part_body/2]).