diff --git a/guides/source/api_app.md b/guides/source/api_app.md
index 181d39e7e0..6494e83a20 100644
--- a/guides/source/api_app.md
+++ b/guides/source/api_app.md
@@ -425,7 +425,7 @@ Some common modules you might want to add:
   ```ruby
   class ApplicationController < ActionController::API
     include ::ActionController::Caching
-    self.cache_store = :mem_cached_store
+    self.cache_store = :mem_cache_store
   end
   ```
   Rails does *not* pass this configuration automatically.