diff --git a/src/exchange/taler-exchange-aggregator.c b/src/exchange/taler-exchange-aggregator.c
index 22bc3c7bb..97d85c812 100644
--- a/src/exchange/taler-exchange-aggregator.c
+++ b/src/exchange/taler-exchange-aggregator.c
@@ -60,7 +60,7 @@ struct AggregationUnit
   /**
    * Hash of @e wire.
    */
-  struct GNUNET_HashCode h_wire;
+  struct TALER_MerchantWireHash h_wire;
 
   /**
    * Wire transfer identifier we use.