diff --git a/Library/Homebrew/dev-cmd/test-bot.rb b/Library/Homebrew/dev-cmd/test-bot.rb
index 71e8ebff31..509780869d 100644
--- a/Library/Homebrew/dev-cmd/test-bot.rb
+++ b/Library/Homebrew/dev-cmd/test-bot.rb
@@ -669,6 +669,7 @@ module Homebrew
         test "brew", "readall", "--syntax"
         if OS.mac? &&
            (HOMEBREW_REPOSITORY/"Library/Homebrew/cask/cmd/brew-cask-tests.rb").exist?
+          run_as_not_developer { test "brew", "tap", "caskroom/cask" }
           test "brew", "cask-tests"
         end