diff --git a/src/couchdb/couch_btree.erl b/src/couchdb/couch_btree.erl
index 2556ed14e9c..ee42d7800cb 100644
--- a/src/couchdb/couch_btree.erl
+++ b/src/couchdb/couch_btree.erl
@@ -15,6 +15,7 @@
 -export([open/2, open/3, query_modify/4, add/2, add_remove/3]).
 -export([fold/4, full_reduce/1, final_reduce/2, size/1, foldl/3, foldl/4]).
 -export([fold_reduce/4, lookup/2, get_state/1, set_options/2]).
+-export([less/3]).
 
 -include("couch_db.hrl").
 -define(CHUNK_THRESHOLD, 16#4ff).