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-rw-r--r--src/rabbit_variable_queue.erl2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/rabbit_variable_queue.erl b/src/rabbit_variable_queue.erl
index bf7d2a5d..f1658028 100644
--- a/src/rabbit_variable_queue.erl
+++ b/src/rabbit_variable_queue.erl
@@ -1363,7 +1363,7 @@ ack(MsgStoreFun, Fun, AckTags, State) ->
gb_trees:delete_any(SeqId, RAI)})}
end, {{[], orddict:new()}, State}, AckTags),
IndexState1 = rabbit_queue_index:ack(SeqIds, IndexState),
- AckdGuids = lists:concat(
+ AckdGuids = lists:append(
orddict:fold(
fun (IsPersistent, Guids, Gs) ->
MsgStoreFun(MSCState, IsPersistent, Guids),