diff --git a/src/rest.erl b/src/rest.erl
index df6ed7f01..18bf1b5ee 100644
--- a/src/rest.erl
+++ b/src/rest.erl
@@ -174,13 +174,13 @@ base_url(Server, Path) ->
     end.
 
 url(Url, []) ->
-    Url;
+    binary_to_list(Url);
 url(Url, Params) ->
     L = [<<"&", (iolist_to_binary(Key))/binary, "=",
           (misc:url_encode(Value))/binary>>
             || {Key, Value} <- Params],
     <<$&, Encoded/binary>> = iolist_to_binary(L),
-    <<Url/binary, $?, Encoded/binary>>.
+    binary_to_list(<<Url/binary, $?, Encoded/binary>>).
 url(Server, Path, Params) ->
     case binary:split(base_url(Server, Path), <<"?">>) of
         [Url] ->