diff --git a/guides/source/action_mailer_basics.md b/guides/source/action_mailer_basics.md
index 513ae1272f111..562ab73becaf3 100644
--- a/guides/source/action_mailer_basics.md
+++ b/guides/source/action_mailer_basics.md
@@ -447,7 +447,7 @@ end
 Action Mailer Callbacks
 ---------------------------
 
-Action Mailer allows for you to specify a `before_action`, `after_action` and 'around_action'.
+Action Mailer allows for you to specify a `before_action`, `after_action` and `around_action`.
 
 * Filters can be specified with a block or a symbol to a method in the mailer class similar to controllers.