diff --git a/lib/stimulus_reflex/cable_readiness.rb b/lib/stimulus_reflex/cable_readiness.rb
index 9bb2345d..8b3aa00a 100644
--- a/lib/stimulus_reflex/cable_readiness.rb
+++ b/lib/stimulus_reflex/cable_readiness.rb
@@ -1,14 +1,8 @@
 # frozen_string_literal: true
 
-require "active_support/concern"
-
 module StimulusReflex
   module CableReadiness
-    extend ActiveSupport::Concern
-
-    prepended do
-      attr_reader :cable_ready
-    end
+    attr_reader :cable_ready
 
     def initialize(*args, **kwargs)
       super(*args, **kwargs)
diff --git a/test/cable_readiness_test.rb b/test/cable_readiness_test.rb
new file mode 100644
index 00000000..14c63187
--- /dev/null
+++ b/test/cable_readiness_test.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+class MyReflexPrepended
+  prepend StimulusReflex::CableReadiness
+
+  def id
+    "123"
+  end
+
+  def stream_name
+    "123"
+  end
+end
+
+class StimulusReflex::CableReadinessTest < ActiveSupport::TestCase
+  test "can be prepended" do
+    reflex = MyReflexPrepended.new
+    assert_includes reflex.methods, :cable_ready
+  end
+end