diff --git a/Library/Homebrew/tap_migrations.rb b/Library/Homebrew/tap_migrations.rb
index a70f1e80e6..09fe155ba5 100644
--- a/Library/Homebrew/tap_migrations.rb
+++ b/Library/Homebrew/tap_migrations.rb
@@ -138,7 +138,6 @@ TAP_MIGRATIONS = {
   "lilypond" => "homebrew/tex",
   "lmutil" => "homebrew/binary",
   "magit" => "homebrew/emacs",
-  "mat" => "homebrew/boneyard",
   "meld" => "homebrew/x11",
   "mesalib-glw" => "homebrew/x11",
   "mess" => "homebrew/games",