diff --git a/virtualsmartcard/src/vpicc/virtualsmartcard/cards/Relay.py b/virtualsmartcard/src/vpicc/virtualsmartcard/cards/Relay.py
index 5788457..114e560 100644
--- a/virtualsmartcard/src/vpicc/virtualsmartcard/cards/Relay.py
+++ b/virtualsmartcard/src/vpicc/virtualsmartcard/cards/Relay.py
@@ -18,7 +18,7 @@
 #
 
 from virtualsmartcard.VirtualSmartcard import SmartcardOS
-import smartcard, logging, sys
+import smartcard, logging, sys, atexit
 
 
 class RelayOS(SmartcardOS):