diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 5b563c2ed0..ca2cf52183 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1766,6 +1766,7 @@ class Formula
     hsh = {
       "name"                     => name,
       "full_name"                => full_name,
+      "tap"                      => tap.name,
       "oldname"                  => oldname,
       "aliases"                  => aliases.sort,
       "versioned_formulae"       => versioned_formulae.map(&:name),