diff --git a/Library/Homebrew/macos.rb b/Library/Homebrew/macos.rb
index da179de310..d44b7627ab 100644
--- a/Library/Homebrew/macos.rb
+++ b/Library/Homebrew/macos.rb
@@ -270,7 +270,7 @@ module MacOS extend self
 
   def mdfind attribute, id
     path = `mdfind "#{attribute} == '#{id}'"`.split("\n").first
-    Pathname.new(path) unless path.empty?
+    Pathname.new(path) unless path.nil? or path.empty?
   end
 
   def pkgutil_info id