diff --git a/lib/airborne.rb b/lib/airborne.rb
index 60d4101..60cf145 100644
--- a/lib/airborne.rb
+++ b/lib/airborne.rb
@@ -10,6 +10,7 @@
   config.add_setting :base_url
   config.add_setting :headers
   config.add_setting :rack_app
+  config.add_setting :rack_browser
   config.add_setting :requester_type
   config.add_setting :requester_module
 end
diff --git a/lib/airborne/base.rb b/lib/airborne/base.rb
index a7c6ef0..a9bdd10 100644
--- a/lib/airborne/base.rb
+++ b/lib/airborne/base.rb
@@ -18,7 +18,7 @@ def self.configure
   def self.included(base)
     if !Airborne.configuration.requester_module.nil?
       base.send(:include, Airborne.configuration.requester_module)
-    elsif !Airborne.configuration.rack_app.nil?
+    elsif !Airborne.configuration.rack_app.nil? || !Airborne.configuration.rack_browser.nil?
       base.send(:include, RackTestRequester)
     else
       base.send(:include, RestClientRequester)
diff --git a/lib/airborne/rack_test_requester.rb b/lib/airborne/rack_test_requester.rb
index abcb652..01f3f9b 100644
--- a/lib/airborne/rack_test_requester.rb
+++ b/lib/airborne/rack_test_requester.rb
@@ -6,7 +6,8 @@ def make_request(method, url, options = {})
       headers = options[:headers] || {}
       base_headers = Airborne.configuration.headers || {}
       headers = base_headers.merge(headers)
-      browser = Rack::Test::Session.new(Rack::MockSession.new(Airborne.configuration.rack_app))
+      browser = Airborne.configuration.rack_browser
+      browser ||= Rack::Test::Session.new(Rack::MockSession.new(Airborne.configuration.rack_app))
       headers.each { |name, value| browser.header(name, value) }
       browser.send(method, url, options[:body] || {}, headers)
       Rack::MockResponse.class_eval do
diff --git a/spec/airborne/rack/rack_sinatra_browser_spec.rb b/spec/airborne/rack/rack_sinatra_browser_spec.rb
new file mode 100644
index 0000000..7dd9ffc
--- /dev/null
+++ b/spec/airborne/rack/rack_sinatra_browser_spec.rb
@@ -0,0 +1,23 @@
+require 'json'
+require 'sinatra'
+
+class SampleApp < Sinatra::Application
+  before do
+    content_type 'application/json'
+  end
+
+  get '/' do
+    { foo: 'bar' }.to_json
+  end
+end
+
+Airborne.configure do |config|
+  config.rack_browser = Rack::Test::Session.new(Rack::MockSession.new(SampleApp))
+end
+
+describe 'rack app via browser' do
+  it 'should allow requests against a sinatra app' do
+    get '/'
+    expect_json_types(foo: :string)
+  end
+end