diff --git a/Library/Homebrew/cmd/doctor.rb b/Library/Homebrew/cmd/doctor.rb
index d101ab7f6e..f703dd1beb 100644
--- a/Library/Homebrew/cmd/doctor.rb
+++ b/Library/Homebrew/cmd/doctor.rb
@@ -232,7 +232,9 @@ def check_for_latest_xcode
 end
 
 def check_for_stray_developer_directory
-  if MacOS::Xcode.version >= "4.3" and File.exist? "/Developer/Library"
+  # if the uninstaller script isn't there, it's a good guess neither are
+  # any troublesome leftover Xcode files
+  if MacOS::Xcode.version >= "4.3" and File.exist? "/Developer/Library/uninstall-developer-folder"
     return <<-EOS.undent
     You have leftover files from an older version of Xcode.
     You should delete them using: