diff --git a/spec/ic.did b/spec/ic.did
index 1e050686c..cb889b33e 100644
--- a/spec/ic.did
+++ b/spec/ic.did
@@ -78,12 +78,12 @@ service ic : {
   ecdsa_public_key : (record {
     canister_id : opt canister_id;
     derivation_path : vec blob;
-    key_id : { curve: ecdsa_curve; name: text };
+    key_id : record { curve: ecdsa_curve; name: text };
   }) -> (record { public_key : blob; chain_code : blob; });
   sign_with_ecdsa : (record {
     message_hash : blob;
     derivation_path : vec blob;
-    key_id : { curve: ecdsa_curve; name: text };
+    key_id : record { curve: ecdsa_curve; name: text };
   }) -> (record { signature : blob });
 
   // provisional interfaces for the pre-ledger world