diff --git a/lib/dry/rails/boot/controller_helpers.rb b/lib/dry/rails/boot/controller_helpers.rb
index 895c1e0..7796759 100644
--- a/lib/dry/rails/boot/controller_helpers.rb
+++ b/lib/dry/rails/boot/controller_helpers.rb
@@ -6,9 +6,12 @@
   end
 
   start do
-    ApplicationController.include(Dry::Rails::Features::ControllerHelpers)
+    unless ApplicationController.include?(Dry::Rails::Features::ControllerHelpers)
+      ApplicationController.include(Dry::Rails::Features::ControllerHelpers)
+    end
 
-    if defined?(ActionController::API)
+    if defined?(ActionController::API) &&
+       !ActionController::API.include?(Dry::Rails::Features::ControllerHelpers)
       ActionController::API.include(Dry::Rails::Features::ControllerHelpers)
     end
   end
diff --git a/lib/dry/rails/boot/safe_params.rb b/lib/dry/rails/boot/safe_params.rb
index 4fd21c2..816b2f1 100644
--- a/lib/dry/rails/boot/safe_params.rb
+++ b/lib/dry/rails/boot/safe_params.rb
@@ -6,9 +6,12 @@
   end
 
   start do
-    ActionController::Base.include(Dry::Rails::Features::SafeParams)
+    unless ActionController::Base.include?(Dry::Rails::Features::SafeParams)
+      ActionController::Base.include(Dry::Rails::Features::SafeParams)
+    end
 
-    if defined?(ActionController::API)
+    if defined?(ActionController::API) &&
+       !ActionController::API.include?(Dry::Rails::Features::SafeParams)
       ActionController::API.include(Dry::Rails::Features::SafeParams)
     end
   end