diff --git a/src/openrpc/device.json b/src/openrpc/device.json
index 00fa53711..9c50ee253 100644
--- a/src/openrpc/device.json
+++ b/src/openrpc/device.json
@@ -704,7 +704,7 @@
           "params": [
             {
               "name":"format",
-              "value": "aac"
+              "value": "AAC"
             },
             {
               "name": "channels",