diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index e7fa45da2b..7a9da2a595 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -17,6 +17,7 @@ require "linkage_checker"
 require "install"
 require "messages"
 require "cask/cask_loader"
+require "cmd/install"
 require "find"
 
 class FormulaInstaller