diff --git a/xyz/openbmc_project/Control/ThermalMode.interface.yaml b/xyz/openbmc_project/Control/ThermalMode.interface.yaml
index b448d69..742ba35 100644
--- a/xyz/openbmc_project/Control/ThermalMode.interface.yaml
+++ b/xyz/openbmc_project/Control/ThermalMode.interface.yaml
@@ -12,7 +12,7 @@
     - name: Supported
       type: array[string]
       flags:
-          - const
+          - readonly
       description: >
           An implemention specific list of supported modes that the thermal
           control application can be configured to provide for a platform.