diff --git a/Library/Homebrew/cask/artifact/abstract_flight_block.rb b/Library/Homebrew/cask/artifact/abstract_flight_block.rb
index d46011c160..64e4d727bf 100644
--- a/Library/Homebrew/cask/artifact/abstract_flight_block.rb
+++ b/Library/Homebrew/cask/artifact/abstract_flight_block.rb
@@ -1,7 +1,6 @@
 # typed: true
 # frozen_string_literal: true
 
-require "method_source"
 require "cask/artifact/abstract_artifact"
 
 module Cask
@@ -38,6 +37,8 @@ module Cask
       end
 
       def to_h
+        require "method_source"
+
         directives.transform_values(&:source)
       end
 
diff --git a/Library/Homebrew/test/cask/cask_spec.rb b/Library/Homebrew/test/cask/cask_spec.rb
index d2b9a28c4e..e11a3e4c9b 100644
--- a/Library/Homebrew/test/cask/cask_spec.rb
+++ b/Library/Homebrew/test/cask/cask_spec.rb
@@ -1,8 +1,6 @@
 # typed: false
 # frozen_string_literal: true
 
-require "method_source"
-
 describe Cask::Cask, :cask do
   let(:cask) { described_class.new("versioned-cask") }