diff --git a/systems/mac/Brewfile b/systems/mac/Brewfile
index 734f36f..d90ce5d 100644
--- a/systems/mac/Brewfile
+++ b/systems/mac/Brewfile
@@ -67,7 +67,7 @@ cask "docker"
 cask "duet"
 cask "elgato-control-center"
 tap "homebrew/cask-versions"
-cask "firefox-developer-edition"
+cask "firefox@developer-edition"
 tap "homebrew/cask-fonts"
 cask "font-source-code-pro"
 cask "google-drive"