diff --git a/python-pytest-salt-factories.spec b/python-pytest-salt-factories.spec
index 1dbc4d5..0aa4340 100644
--- a/python-pytest-salt-factories.spec
+++ b/python-pytest-salt-factories.spec
@@ -92,7 +92,7 @@ export PYTHONDONTWRITEBYTECODE=1
 # Run test and exclude some that doesn't work fine in OBS.
 donttest="ssh or echoext"
 # Flaky tests for aarch64, ppc, arm
-donttest+="or test_all_messages_received"
+donttest+=" or test_all_messages_received"
 
 # All these tests are failing with python >3.11
 # tests/integration/factories/cli/test_salt.py::test_merged_json_out