diff --git a/duplicity-backup.sh b/duplicity-backup.sh
index 40f08a3..06a8e6c 100755
--- a/duplicity-backup.sh
+++ b/duplicity-backup.sh
@@ -1160,6 +1160,10 @@ 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 DPBX_ACCESS_TOKEN
 unset PASSPHRASE
 unset SIGN_PASSPHRASE