diff --git a/lib/kamal/commands/builder.rb b/lib/kamal/commands/builder.rb
index beb7e289..750482f2 100644
--- a/lib/kamal/commands/builder.rb
+++ b/lib/kamal/commands/builder.rb
@@ -1,3 +1,5 @@
+require "active_support/core_ext/string/filters"
+
 class Kamal::Commands::Builder < Kamal::Commands::Base
   delegate :create, :remove, :push, :clean, :pull, :info, to: :target