diff --git a/spec/services/forest_liana/schema_adapter_spec.rb b/spec/services/forest_liana/schema_adapter_spec.rb
index 2263974d..4a2e7921 100644
--- a/spec/services/forest_liana/schema_adapter_spec.rb
+++ b/spec/services/forest_liana/schema_adapter_spec.rb
@@ -43,7 +43,6 @@ module ForestLiana
 
         context 'when the polymorphic support was disabled' do
           it 'should not define the association' do
-            ENV['ENABLE_SUPPORT_POLYMORPHISM'] = 'false'
             Bootstrapper.new(true)
             collection = ForestLiana.apimap.find do |object|
               object.name.to_s == ForestLiana.name_for(Address)
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 65ef2563..1ff43ef5 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -19,7 +19,6 @@
 # See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
 RSpec.configure do |config|
   ENV['RAILS_ENV'] = 'test'
-  ENV['ENABLE_SUPPORT_POLYMORPHISM'] = 'true'
 
   require File.expand_path('../dummy/config/environment', __FILE__)