diff --git a/zuul.d/ironic-python-agent-jobs.yaml b/zuul.d/ironic-python-agent-jobs.yaml
index 2558cea45..02de9496b 100644
--- a/zuul.d/ironic-python-agent-jobs.yaml
+++ b/zuul.d/ironic-python-agent-jobs.yaml
@@ -16,6 +16,7 @@
         override-checkout: 2.0.0
     vars:
       devstack_localrc:
+        IRONIC_VM_SPECS_RAM: 512
         IRONIC_BUILD_DEPLOY_RAMDISK: True
         USE_PYTHON3: True