diff --git a/start.sh b/start.sh
index c538767..7e48a70 100755
--- a/start.sh
+++ b/start.sh
@@ -86,7 +86,7 @@ ${LSMB_MAIL_SMTPHOST:+smtphost=$LSMB_MAIL_SMTPHOST
 }${LSMB_MAIL_SMTPAUTHMECH:+smtpauthmech=$LSMB_MAIL_SMTPAUTHMECH
 }
 [proxy]
-ip=${PROXY_IP:-172.17.0.1/16}
+ip=${PROXY_IP:-172.17.0.1/12}
 EOF
   export LSMB_CONFIG_FILE='/tmp/ledgersmb.conf'
 fi