diff --git a/src/exchange/taler-exchange-httpd_refresh_reveal.c b/src/exchange/taler-exchange-httpd_refresh_reveal.c
index 8ac8636d9..8062410e3 100644
--- a/src/exchange/taler-exchange-httpd_refresh_reveal.c
+++ b/src/exchange/taler-exchange-httpd_refresh_reveal.c
@@ -614,6 +614,7 @@ handle_refresh_reveal_json (struct MHD_Connection *connection,
                                                TALER_EC_REFRESH_REVEAL_FRESH_DENOMINATION_KEY_NOT_FOUND,
                                                "new_denoms");
       }
+      GNUNET_assert (NULL != dkis[i]->denom_priv.rsa_private_key);
     }
 
     /* Parse coin envelopes */
diff --git a/src/exchange/taler-exchange-httpd_reserve_withdraw.c b/src/exchange/taler-exchange-httpd_reserve_withdraw.c
index 6b86a803b..d42168abc 100644
--- a/src/exchange/taler-exchange-httpd_reserve_withdraw.c
+++ b/src/exchange/taler-exchange-httpd_reserve_withdraw.c
@@ -392,6 +392,7 @@ TEH_RESERVE_handler_reserve_withdraw (struct TEH_RequestHandler *rh,
 					   TALER_EC_WITHDRAW_DENOMINATION_KEY_NOT_FOUND,
                                            "denom_pub");
   }
+  GNUNET_assert (NULL != wc.dki->denom_priv.rsa_private_key);
   TALER_amount_ntoh (&amount,
                      &wc.dki->issue.properties.value);
   TALER_amount_ntoh (&fee_withdraw,