diff --git a/python/tests/test_0_complex_or_slow.py b/python/tests/test_0_complex_or_slow.py
index 9bb06c464..5390ff44d 100644
--- a/python/tests/test_0_complex_or_slow.py
+++ b/python/tests/test_0_complex_or_slow.py
@@ -1,4 +1,5 @@
 import sys
+import time
 
 import pytest
 
@@ -220,6 +221,8 @@ def test_fetch_existing(acfactory, lp, mvbox_move):
         assert idle1.wait_for_seen()
     assert_folders_configured(ac1)
 
+    time.sleep(30)  # Wait until the message is indexed.
+
     lp.sec("create a cloned ac1 and fetch contact history during configure")
     ac1_clone = acfactory.new_online_configuring_account(cloned_from=ac1, fetch_existing_msgs=True)
     acfactory.wait_configured(ac1_clone)