diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index c40a72fccc..08766ea378 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -117,6 +117,7 @@ RSpec.configure do |config|
         HOMEBREW_PINNED_KEGS,
         HOMEBREW_PREFIX/".git",
         HOMEBREW_PREFIX/"bin",
+        HOMEBREW_PREFIX/"etc",
         HOMEBREW_PREFIX/"share",
         HOMEBREW_PREFIX/"opt",
         HOMEBREW_PREFIX/"Caskroom",