diff --git a/Library/Homebrew/cmd/update-report.rb b/Library/Homebrew/cmd/update-report.rb
index ff5ab155bf..c22daf8f6b 100644
--- a/Library/Homebrew/cmd/update-report.rb
+++ b/Library/Homebrew/cmd/update-report.rb
@@ -4,6 +4,7 @@
 require "migrator"
 require "formulary"
 require "cask/cask_loader"
+require "cask/migrator"
 require "descriptions"
 require "cleanup"
 require "description_cache_store"