diff --git a/debian/libnotmuch2.symbols b/debian/libnotmuch2.symbols
index 464bba0f..507600c8 100644
--- a/debian/libnotmuch2.symbols
+++ b/debian/libnotmuch2.symbols
@@ -47,6 +47,7 @@ libnotmuch.so.2 libnotmuch2 #MINVER#
  notmuch_messages_move_to_next@Base 0.3
  notmuch_messages_valid@Base 0.3
  notmuch_query_count_messages@Base 0.3
+ notmuch_query_count_threads@Base 0.10~rc1
  notmuch_query_create@Base 0.3
  notmuch_query_destroy@Base 0.3
  notmuch_query_get_query_string@Base 0.4