Don't unnecessarily depend on mochiweb
diff --git a/src/couchperuser.erl b/src/couchperuser.erl
index 27a7489..b7a1d5c 100644
--- a/src/couchperuser.erl
+++ b/src/couchperuser.erl
@@ -124,7 +124,8 @@
     end.
 
 user_db_name(User) ->
-    <<"userdb-", (iolist_to_binary(mochihex:to_hex(User)))/binary>>.
+    HexUser = list_to_binary([integer_to_list(X, 16) || <<X>> <= User]),
+    <<"userdb-", HexUser/binary>>.
 
 handle_call(_Msg, _From, State) ->
     {reply, error, State}.