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-rw-r--r--src/lib/exchange_api_common.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/lib/exchange_api_common.c b/src/lib/exchange_api_common.c
index a564a367c..da1400b9d 100644
--- a/src/lib/exchange_api_common.c
+++ b/src/lib/exchange_api_common.c
@@ -527,8 +527,9 @@ TALER_EXCHANGE_verify_coin_history (
&dr.h_denom_pub),
TALER_JSON_spec_absolute_time_nbo ("timestamp",
&dr.wallet_timestamp),
- TALER_JSON_spec_absolute_time_nbo ("refund_deadline",
- &dr.refund_deadline),
+ GNUNET_JSON_spec_mark_optional (
+ TALER_JSON_spec_absolute_time_nbo ("refund_deadline",
+ &dr.refund_deadline)),
TALER_JSON_spec_amount_any_nbo ("deposit_fee",
&dr.deposit_fee),
GNUNET_JSON_spec_fixed_auto ("merchant_pub",