diff --git a/web/config.py b/web/config.py
index 707b8e94e..bda2f9097 100644
--- a/web/config.py
+++ b/web/config.py
@@ -388,7 +388,7 @@ SECURITY_EMAIL_SUBJECT_PASSWORD_CHANGE_NOTICE = \
 # flask-security-too will validate email addresses and check deliverability
 # by default. Disable the deliverability check by default, which was the old
 # behaviour in <= v5.3
-SECURITY_EMAIL_VALIDATOR_ARGS={"check_deliverability": False}
+SECURITY_EMAIL_VALIDATOR_ARGS = {"check_deliverability": False}
 
 ##########################################################################
 # Upgrade checks