diff --git a/Library/Homebrew/blacklist.rb b/Library/Homebrew/blacklist.rb
index 8770815c12..fc8ad618e5 100644
--- a/Library/Homebrew/blacklist.rb
+++ b/Library/Homebrew/blacklist.rb
@@ -1,6 +1,6 @@
 def blacklisted? name
   case name.downcase
-  when 'screen', /^rubygems?$/, then <<-EOS.undent
+  when 'screen', /^rubygems?$/ then <<-EOS.undent
     Apple distributes #{name} with OS X, you can find it in /usr/bin.
     EOS
   when 'libpcap' then <<-EOS.undent