diff --git a/src/api.ml b/src/api.ml
index 81e2ba7f..01e37c8b 100644
--- a/src/api.ml
+++ b/src/api.ml
@@ -1014,7 +1014,7 @@ module DenomGroup = struct
     let rsa = Case.map "RSA" RsaDenomGroup.jsont ~dec:of_rsa in
     let enc_case = function Rsa v -> Case.value rsa v in
     let cases = Case.[ make rsa ] in
-    map ~kind:"DenominationKey" Fun.id
+    map ~kind:"DenomGroup" Fun.id
     |> case_mem "cipher" Jsont.string ~enc:Fun.id ~enc_case cases
     |> finish
 end