diff --git a/lib/protocol/rack/adapter/generic.rb b/lib/protocol/rack/adapter/generic.rb
index 21e83b6..ebf7aa9 100644
--- a/lib/protocol/rack/adapter/generic.rb
+++ b/lib/protocol/rack/adapter/generic.rb
@@ -44,6 +44,10 @@ def initialize(app)
 					raise ArgumentError, "App must be callable!" unless @app.respond_to?(:call)
 				end
 				
+				# Rack does not define an application lifecycle hook, so there is nothing to close.
+				def close
+				end
+				
 				# The logger to use for this adapter.
 				# 
 				# @returns [Console] The console logger.
diff --git a/test/protocol/rack/adapter.rb b/test/protocol/rack/adapter.rb
index ad3e245..4281e38 100644
--- a/test/protocol/rack/adapter.rb
+++ b/test/protocol/rack/adapter.rb
@@ -19,6 +19,16 @@
 		expect(subject.parse_file(rackup_path)).to be_a(Proc)
 	end
 	
+	with "#close" do
+		it "can be closed" do
+			app = ->(env){[200, {}, []]}
+			adapter = subject.new(app)
+			
+			expect(adapter).to be(:respond_to?, :close)
+			expect(adapter.close).to be_nil
+		end
+	end
+	
 	with ".make_response" do
 		let(:env) {Rack::MockRequest.env_for("/")}