diff --git a/Library/Homebrew/cmd/update.rb b/Library/Homebrew/cmd/update.rb
index 17dbf3a190..5c9a63b487 100644
--- a/Library/Homebrew/cmd/update.rb
+++ b/Library/Homebrew/cmd/update.rb
@@ -148,7 +148,7 @@ module Homebrew
   end
 
   def load_tap_migrations
-    load "tap_migrations"
+    load "tap_migrations.rb"
   rescue LoadError
     false
   end