diff --git a/scripts/upgrade b/scripts/upgrade
index 3a39fe341a94c3767550a3873f33dbea1c20cf93..71d11a55fe3d98b1671458cf173776257e4ea7f0 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -30,9 +30,9 @@ if [[ "$version" == "0.2.1" ]]; then
     cd $RENEW_CERT_PATH
     sudo ve/bin/python renew_from_cube.py
 
-    cat <<EOF > /etc/cron.daily/neutrinet-renew-cert.sh
+    cat <<EOF > /etc/cron.daily/neutrinet-renew-cert
 #!/bin/bash
 cd $RENEW_CERT_PATH && ve/bin/python renew_from_cube.py
 EOF
-    chmod 0755 /etc/cron.daily/neutrinet-renew-cert.sh
+    chmod 0755 /etc/cron.daily/neutrinet-renew-cert
 fi