diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 38e77203cf..03467b98a5 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -197,6 +197,7 @@ module OS
 
       def outdated?
         version = `/usr/bin/clang --version`[%r{clang-(\d+\.\d+\.\d+)}, 1]
+        return true unless version
         version < latest_version
       end