diff --git a/yaml/xyz/openbmc_project/State/Host.interface.yaml b/yaml/xyz/openbmc_project/State/Host.interface.yaml
index 6d3f4a4..95f3b19 100644
--- a/yaml/xyz/openbmc_project/State/Host.interface.yaml
+++ b/yaml/xyz/openbmc_project/State/Host.interface.yaml
@@ -13,7 +13,7 @@
           - xyz.openbmc_project.Common.Error.NotAllowed
 
     - name: AllowedHostTransitions
-      type: array[enum[self.Transition]]
+      type: set[enum[self.Transition]]
       flags:
           - const
       description: >