diff --git a/src/lib/exchange_api_handle.c b/src/lib/exchange_api_handle.c
index 8c7cbeda0..a9203dead 100644
--- a/src/lib/exchange_api_handle.c
+++ b/src/lib/exchange_api_handle.c
@@ -1008,6 +1008,8 @@ free_key_data (struct TALER_EXCHANGE_Keys *key_data)
                      0);
   GNUNET_free (key_data->version);
   key_data->version = NULL;
+  GNUNET_free (key_data->currency);
+  key_data->currency = NULL;
 }