diff --git a/zuul.d/ironic-jobs.yaml b/zuul.d/ironic-jobs.yaml
index 4b106c5829..0b3d2055a5 100644
--- a/zuul.d/ironic-jobs.yaml
+++ b/zuul.d/ironic-jobs.yaml
@@ -98,10 +98,9 @@
       - ^tox.ini$
     vars:
       tempest_test_regex: ironic_standalone
-      tempest_concurrency: 4
+      tempest_concurrency: 3
       devstack_localrc:
         FORCE_CONFIG_DRIVE: False
-
         IRONIC_AUTOMATED_CLEAN_ENABLED: False
         IRONIC_DEFAULT_DEPLOY_INTERFACE: direct
         IRONIC_ENABLED_DEPLOY_INTERFACES: "iscsi,direct,ansible"