1 files changed, 4 insertions, 4 deletions
diff --git a/src/exchange-lib/testing_api_trait_wtid.c b/src/exchange-lib/testing_api_trait_wtid.c
index 8406dbbb..67232971 100644
--- a/src/exchange-lib/testing_api_trait_wtid.c
+++ b/src/exchange-lib/testing_api_trait_wtid.c
@@ -44,26 +44,26 @@ int
 TALER_TESTING_get_trait_wtid
   (const struct TALER_TESTING_Command *cmd,
    unsigned int index,
-   struct TALER_WireTransferIdentifierRawP **wtid)
+   const struct TALER_WireTransferIdentifierRawP **wtid)
 {
   return cmd->traits (cmd->cls,
-                      (void **) wtid,
+                      (const void **) wtid,
                       TALER_TESTING_TRAIT_WTID,
                       index);
 }
 
+
 /**
  * Offer a WTID.
  *
  * @param index associate the object with this index
  * @param wtid which object should be returned
- *
  * @return the trait.
  */
 struct TALER_TESTING_Trait
 TALER_TESTING_make_trait_wtid
   (unsigned int index,
-   struct TALER_WireTransferIdentifierRawP *wtid)
+   const struct TALER_WireTransferIdentifierRawP *wtid)
 {
   struct TALER_TESTING_Trait ret = {
     .index = index,