diff --git a/setup/flavors/compose/mailu.env b/setup/flavors/compose/mailu.env
index b0da2127..ed967686 100644
--- a/setup/flavors/compose/mailu.env
+++ b/setup/flavors/compose/mailu.env
@@ -162,7 +162,7 @@ REJECT_UNLISTED_RECIPIENT={{ reject_unlisted_recipient }}
 ###################################
 # Advanced settings
 ###################################
-DB_FLAVOR = {{ db_flavor }}
+DB_FLAVOR={{ db_flavor }}
 {% if postgresql == 'external' %}
 DB_USER={{ db_user }}
 DB_PW={{ db_pw }}