diff --git a/src/http_management.ml b/src/http_management.ml
index a8dda624..72144975 100644
--- a/src/http_management.ml
+++ b/src/http_management.ml
@@ -77,7 +77,14 @@ module Keys_post = struct
     list_iter
       (fun SignKeySignature.{ key; master_sig } ->
         match List.find_opt (fun sk -> sk.FutureSignKey.key = key) fsk_l with
-        | None -> Error "future signkey not found"
+        | None ->
+            (
+            let* opt = Keys.find_signkey key in
+            match opt with
+            | None ->
+            Error "future signkey not found"
+            | Some _sk ->
+                )
         | Some fsk -> verify_sk (module Keys) fsk master_sig)
       signkey_sigs