diff --git a/components/mailer.rst b/components/mailer.rst
index 1f004e90bc6..7e2dd89e798 100644
--- a/components/mailer.rst
+++ b/components/mailer.rst
@@ -171,7 +171,7 @@ configurable with the ``verify_peer`` option. Although it's not recommended to
 disable this verification for security reasons, it can be useful while developing
 the application or when using a self-signed certificate::
 
-    $dsn = 'smtp://user:pass@smtp.example.com?verify_peer=false'
+    $dsn = 'smtp://user:pass@smtp.example.com?verify_peer=0'
 
 .. versionadded:: 5.1