diff --git a/src/exchange/taler-exchange-httpd_keys.c b/src/exchange/taler-exchange-httpd_keys.c
index ff5d1f410..cc93a4201 100644
--- a/src/exchange/taler-exchange-httpd_keys.c
+++ b/src/exchange/taler-exchange-httpd_keys.c
@@ -2318,6 +2318,7 @@ add_denom_key_cb (void *cls,
  * Add the headers we want to set for every /keys response.
  *
  * @param ksh the key state to use
+ * @param wsh wire state to use
  * @param[in,out] response the response to modify
  * @return #GNUNET_OK on success
  */