diff --git a/spec/rggen/markdown/register_block/markdown_spec.rb b/spec/rggen/markdown/register_block/markdown_spec.rb
index 272ac6f..3edde01 100644
--- a/spec/rggen/markdown/register_block/markdown_spec.rb
+++ b/spec/rggen/markdown/register_block/markdown_spec.rb
@@ -35,9 +35,16 @@
     end
 
     before(:all) do
+      RgGen.define_simple_feature(:register_block, :protocol) do
+        configuration { build {} }
+      end
       RgGen.enable_all
     end
 
+    after(:all) do
+      RgGen.delete(:register_block, :protocol)
+    end
+
     before do
       allow(FileUtils).to receive(:mkpath)
     end