diff --git a/spec/bundle/brew_dumper_spec.rb b/spec/bundle/brew_dumper_spec.rb
index 5b9f5aafb..d6a8cdbdf 100644
--- a/spec/bundle/brew_dumper_spec.rb
+++ b/spec/bundle/brew_dumper_spec.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "ostruct"
 require "spec_helper"
 require "tsort"
 require "formula"
diff --git a/spec/bundle/skipper_spec.rb b/spec/bundle/skipper_spec.rb
index c92a22515..ad2f081d7 100644
--- a/spec/bundle/skipper_spec.rb
+++ b/spec/bundle/skipper_spec.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "ostruct"
 require "spec_helper"
 
 describe Bundle::Skipper do
diff --git a/spec/stub/formula.rb b/spec/stub/formula.rb
index 3022d948e..71abb55cd 100644
--- a/spec/stub/formula.rb
+++ b/spec/stub/formula.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "ostruct"
 require "pathname"
 
 class Formula
diff --git a/spec/stub/os.rb b/spec/stub/os.rb
index cdcce433b..e93bee944 100644
--- a/spec/stub/os.rb
+++ b/spec/stub/os.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "ostruct"
+
 module MacOS
   module CLT
     def self.version
diff --git a/spec/stub/tap.rb b/spec/stub/tap.rb
index d7a956b64..192ca489d 100644
--- a/spec/stub/tap.rb
+++ b/spec/stub/tap.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "ostruct"
+
 class Tap
   def self.select(*)
     []