diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index cca54f229e..02f286a946 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -349,7 +349,7 @@ module MacOS extend self
 
   def clang_build_version
     @clang_build_version ||= if File.exist? "/usr/bin/clang"
-      `/usr/bin/clang --version` =~ %r[tags/Apple/clang-(\d{3}(\.\d)*)]
+      `/usr/bin/clang --version` =~ %r[tags/Apple/clang-(\d{2,3}(\.\d)*)]
       $1
     end
   end