diff --git a/trustify/client/payment_challenge.py b/trustify/client/payment_challenge.py
index 0a5d38d6a..9bef7594d 100644
--- a/trustify/client/payment_challenge.py
+++ b/trustify/client/payment_challenge.py
@@ -1,5 +1,6 @@
 from trustify.client.challenge import Challenge
 from trustify.client import logger
+import dialog
 
 ############################################################
 # Possible addition to challenge structure: priority parameter