diff --git a/Library/Homebrew/formula_auditor.rb b/Library/Homebrew/formula_auditor.rb
index afcfa525f7..68deb02245 100644
--- a/Library/Homebrew/formula_auditor.rb
+++ b/Library/Homebrew/formula_auditor.rb
@@ -495,7 +495,7 @@ module Homebrew
         end
 
         next if spec.patches.empty?
-        next unless @new_formula
+        next if !@new_formula || !@core_tap
 
         new_formula_problem(
           "Formulae should not require patches to build. " \