diff --git a/pkg/arvo/sur/json/rpc.hoon b/pkg/arvo/sur/json/rpc.hoon
index 350f2cae19..809c1935a4 100644
--- a/pkg/arvo/sur/json/rpc.hoon
+++ b/pkg/arvo/sur/json/rpc.hoon
@@ -3,6 +3,7 @@
 |%
 +$  request
   $:  id=@t
+      jsonrpc=@t
       method=@t
       params=request-params
   ==