diff --git a/nopaque.env.tpl b/nopaque.env.tpl
index 390e99bbbfec0bc6a5275780471975a64f9d241e..7bc4e2d4af74c8240432575fca4a3a55887947f8 100644
--- a/nopaque.env.tpl
+++ b/nopaque.env.tpl
@@ -28,5 +28,5 @@ GUNICORN_WORKERS=
 
 ### nopaque ###
 NOPAQUE_ADMIN=
-NOPAQUE_MAIL_SENDER
+NOPAQUE_MAIL_SENDER=
 NOPAQUE_STORAGE=