diff --git a/tasks/main.yml b/tasks/main.yml
index ed9d5b6..aebe114 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -73,7 +73,7 @@
       SMTPD_RECIPIENT_RESTRICTIONS:
         "{{ postfix_recipient_restrictions | join(', ') }}"
       MESSAGE_SIZE_LIMIT:
-        "{{ postfix_message_size_limit }}"
+        "{{ postfix_message_size_limit | string }}"
       SMTPD_HELO_REQUIRED:
         "{{ 'yes' if postfix_helo_required else 'no' }}"
       BIFF: