diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 09b34ad87d..f643f13fd1 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -85,7 +85,7 @@ module OS
     #      specifically been requested according to the rules above.
 
     def sdk(v = nil)
-      @locator ||= if Xcode.without_clt?
+      @locator ||= if Xcode.installed?
         XcodeSDKLocator.new
       else
         CLTSDKLocator.new