diff --git a/Library/Homebrew/cmd/test-bot.rb b/Library/Homebrew/cmd/test-bot.rb
index 15c9f97674..4e339fe659 100644
--- a/Library/Homebrew/cmd/test-bot.rb
+++ b/Library/Homebrew/cmd/test-bot.rb
@@ -617,7 +617,7 @@ module Homebrew
       tap ||= bot_argv.value('tap')
     end
 
-    tap.gsub! /homebrew\/homebrew-/i, "Homebrew/" if tap
+    tap.gsub!(/homebrew\/homebrew-/i, "Homebrew/") if tap
 
     git_url = ENV['UPSTREAM_GIT_URL'] || ENV['GIT_URL']
     if !tap && git_url