diff --git a/Library/Homebrew/requirements/cctools_requirement.rb b/Library/Homebrew/requirements/cctools_requirement.rb
index ab7f8cb59c..65a10b4b6a 100644
--- a/Library/Homebrew/requirements/cctools_requirement.rb
+++ b/Library/Homebrew/requirements/cctools_requirement.rb
@@ -5,9 +5,9 @@
 # CLT installed (but still want to install bottled formulae).
 class CctoolsRequirement < Requirement
   fatal true
-  default_formula 'cctools'
+  default_formula "cctools"
 
   satisfy(:build_env => false) do
-    MacOS::Xcode.installed? || MacOS::CLT.installed? || Formula['cctools'].installed?
+    MacOS::Xcode.installed? || MacOS::CLT.installed? || Formula["cctools"].installed?
   end
 end