1 files changed, 3 insertions, 3 deletions

diff --git a/src/lib/merchant_api_lock_product.c b/src/lib/merchant_api_lock_product.c
index a3c345d5..3a3caaeb 100644
--- a/src/lib/merchant_api_lock_product.c
+++ b/src/lib/merchant_api_lock_product.c
@@ -159,7 +159,7 @@ TALER_MERCHANT_product_lock (
   struct GNUNET_CURL_Context *ctx,
   const char *backend_url,
   const char *product_id,
-  const struct GNUNET_Uuid *uuid,
+  const char *uuid,
   struct GNUNET_TIME_Relative duration,
   uint32_t quantity,
   TALER_MERCHANT_ProductLockCallback cb,
@@ -169,8 +169,8 @@ TALER_MERCHANT_product_lock (
   json_t *req_obj;
 
   req_obj = GNUNET_JSON_PACK (
-    GNUNET_JSON_pack_data_auto ("lock_uuid",
-                                uuid),
+    GNUNET_JSON_pack_string ("lock_uuid",
+                             uuid),
     GNUNET_JSON_pack_time_rel ("duration",
                                duration),
     GNUNET_JSON_pack_uint64 ("quantity",