diff --git a/src/exchange-lib/testing_api_cmd_bank_check.c b/src/exchange-lib/testing_api_cmd_bank_check.c
index 2b471eed7..6d1d3c143 100644
--- a/src/exchange-lib/testing_api_cmd_bank_check.c
+++ b/src/exchange-lib/testing_api_cmd_bank_check.c
@@ -210,7 +210,8 @@ check_bank_transfer_traits (void *cls,
        &bcs->wtid,
        sizeof (struct TALER_WireTransferIdentifierRawP)))
     wtid_ptr = NULL;
-  wtid_ptr = &bcs->wtid;
+  else
+    wtid_ptr = &bcs->wtid;
 
   struct TALER_TESTING_Trait traits[] = {
     TALER_TESTING_make_trait_transfer_subject (0, bcs->subject),