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-rw-r--r--lib/database.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/database.cc b/lib/database.cc
index 8641321..2b5b64d 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -1306,7 +1306,7 @@ _notmuch_database_generate_thread_id (notmuch_database_t *notmuch)
notmuch->last_thread_id++;
- sprintf (thread_id, "%016llx", notmuch->last_thread_id);
+ sprintf (thread_id, "%016" PRIx64, notmuch->last_thread_id);
db->set_metadata ("last_thread_id", thread_id);