diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index 2313210c8a..3031765e65 100644
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -135,7 +135,7 @@ class Build
     }
 
     with_env(new_env) do
-      formula.extend(Debrew::Formula) if Homebrew.args.debug?
+      formula.extend(Debrew::Formula) if args.debug?
 
       formula.update_head_version
 
diff --git a/Library/Homebrew/test.rb b/Library/Homebrew/test.rb
index 233c323383..7167aabeb4 100644
--- a/Library/Homebrew/test.rb
+++ b/Library/Homebrew/test.rb
@@ -25,7 +25,7 @@ begin
   formula = args.resolved_formulae.first
   formula.extend(Homebrew::Assertions)
   formula.extend(Homebrew::FreePort)
-  formula.extend(Debrew::Formula) if Homebrew.args.debug?
+  formula.extend(Debrew::Formula) if args.debug?
 
   ENV.extend(Stdenv)
   ENV.setup_build_environment(formula: formula)