diff --git a/duplicity-backup.sh b/duplicity-backup.sh
index 8fa9dfb..5bbe007 100755
--- a/duplicity-backup.sh
+++ b/duplicity-backup.sh
@@ -1151,6 +1151,10 @@ unset AWS_ACCESS_KEY_ID
 unset AWS_SECRET_ACCESS_KEY
 unset GS_ACCESS_KEY_ID
 unset GS_SECRET_ACCESS_KEY
+unset SWIFT_USERNAME
+unset SWIFT_PASSWORD
+unset SWIFT_AUTHURL
+unset SWIFT_AUTHVERSION
 unset PASSPHRASE
 unset SIGN_PASSPHRASE
 unset FTP_PASSWORD