diff --git a/docs/DEVELOPER-ADVANCED.md b/docs/DEVELOPER-ADVANCED.md
index 1b21fa38dfc..9e0ac26a591 100644
--- a/docs/DEVELOPER-ADVANCED.md
+++ b/docs/DEVELOPER-ADVANCED.md
@@ -23,7 +23,7 @@ To get your Ubuntu 16.04 LTS install up and running to develop Discourse and Dis
 
     rvm install 2.5.1
     rvm --default use 2.5.1 # If this error out check https://rvm.io/integration/gnome-terminal
-    gem install bundler mailcatcher
+    gem install bundler mailcatcher rake
 
     # Postgresql
     sudo -u postgres -i