diff --git a/fstest/testserver/init.d/TestSMBKerberos b/fstest/testserver/init.d/TestSMBKerberos
index ddf0d87b3..78a03868a 100755
--- a/fstest/testserver/init.d/TestSMBKerberos
+++ b/fstest/testserver/init.d/TestSMBKerberos
@@ -34,6 +34,7 @@ RUN rm -rf /etc/samba/smb.conf /var/lib/samba \
     --dns-backend=SAMBA_INTERNAL \
     --host-name=localhost \
  && samba-tool user add --random-password $USER \
+ && samba-tool user setexpiry $USER --noexpiry \
  && mkdir -m 777 /share /rclone \
  && cat <<EOS >> /etc/samba/smb.conf
 [public]