diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 516388c688..b79d8bb427 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -323,7 +323,7 @@ class FormulaAuditor
       end
       valid_alias_names = [alias_name_major, alias_name_major_minor]
 
-      if formula.tap
+      if formula.tap && !formula.tap.core_tap?
         valid_alias_names.map! { |a| "#{formula.tap}/#{a}" }
       end