diff --git a/config/environments/preproduction.rb b/config/environments/preproduction.rb
index 5dfdcacd6..78a443249 100644
--- a/config/environments/preproduction.rb
+++ b/config/environments/preproduction.rb
@@ -13,7 +13,7 @@ Rails.application.configure do
   # Because autoloading is disabled in production environments with Rails 5,
   # using autoload_paths will not load needed classes from specified paths.
   # The solution to this, is to ask Rails to eager load classes.
-  config.eager_load_paths << "#{config.root}/lib"
+  config.eager_load_paths += ["#{config.root}/lib"]
 
   # Full error reports are disabled and caching is turned on.
   config.consider_all_requests_local       = false
diff --git a/config/environments/production.rb b/config/environments/production.rb
index d66dd3b3d..2972eb78f 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -13,7 +13,7 @@ Rails.application.configure do
   # Because autoloading is disabled in production environments with Rails 5,
   # using autoload_paths will not load needed classes from specified paths.
   # The solution to this, is to ask Rails to eager load classes.
-  config.eager_load_paths << "#{config.root}/lib"
+  config.eager_load_paths += ["#{config.root}/lib"]
 
   # Full error reports are disabled and caching is turned on.
   config.consider_all_requests_local       = false
diff --git a/config/environments/staging.rb b/config/environments/staging.rb
index 5a47275cc..8e64e9fae 100644
--- a/config/environments/staging.rb
+++ b/config/environments/staging.rb
@@ -13,7 +13,7 @@ Rails.application.configure do
   # Because autoloading is disabled in production environments with Rails 5,
   # using autoload_paths will not load needed classes from specified paths.
   # The solution to this, is to ask Rails to eager load classes.
-  config.eager_load_paths << "#{config.root}/lib"
+  config.eager_load_paths += ["#{config.root}/lib"]
 
   # Full error reports are disabled and caching is turned on.
   config.consider_all_requests_local       = false