diff --git a/compose.smtp.yml b/compose.smtp.yml
index ec34511..8821d0a 100644
--- a/compose.smtp.yml
+++ b/compose.smtp.yml
@@ -8,7 +8,7 @@ services:
       - PEERTUBE_SMTP_ENABLED
       - PEERTUBE_SMTP_FROM
       - PEERTUBE_SMTP_HOSTNAME
-      - PEERTUBE_SMTP_PASSWORD_FILE: /run/secrets/smtp_password
+      - PEERTUBE_SMTP_PASSWORD_FILE=/run/secrets/smtp_password
       - PEERTUBE_SMTP_PORT
       - PEERTUBE_SMTP_TLS
       - PEERTUBE_SMTP_USERNAME