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-rw-r--r--lib/message.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/message.cc b/lib/message.cc
index 03b8c812..49519f1e 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -318,7 +318,7 @@ _notmuch_message_get_in_reply_to (notmuch_message_t *message)
in_reply_to = *i;
if (i != message->doc.termlist_end () &&
- strncmp ((*i).c_str (), prefix, prefix_len))
+ strncmp ((*i).c_str (), prefix, prefix_len) == 0)
{
INTERNAL_ERROR ("Message %s has duplicate In-Reply-To IDs: %s and %s\n",
notmuch_message_get_message_id (message),