diff --git a/charts/t8s-cluster/values.schema.json b/charts/t8s-cluster/values.schema.json
index e8ea234094..69f50d9860 100644
--- a/charts/t8s-cluster/values.schema.json
+++ b/charts/t8s-cluster/values.schema.json
@@ -245,7 +245,6 @@
     "metadata",
     "version",
     "controlPlane",
-    "openstackImageNamePrefix",
     "nodePools"
   ],
   "additionalProperties": false,