diff --git a/lib/mongoid/railtie.rb b/lib/mongoid/railtie.rb
index 40a49eafbd..95e1543f5b 100644
--- a/lib/mongoid/railtie.rb
+++ b/lib/mongoid/railtie.rb
@@ -118,11 +118,7 @@ def self.rescue_responses
 
       # Need to include the Mongoid identity map middleware.
       initializer "include the identity map" do |app|
-        if ::Mongoid.running_with_passenger?
-          app.config.middleware.use "Rack::Mongoid::Middleware::IdentityMap::Passenger"
-        else
-          app.config.middleware.use "Rack::Mongoid::Middleware::IdentityMap"
-        end
+        app.config.middleware.use "Rack::Mongoid::Middleware::IdentityMap"
       end
 
       # Instantitate any registered observers after Rails initialization and
diff --git a/lib/rack/mongoid.rb b/lib/rack/mongoid.rb
index 9b2708702c..a054a4963f 100644
--- a/lib/rack/mongoid.rb
+++ b/lib/rack/mongoid.rb
@@ -1,3 +1,2 @@
 # encoding: utf-8
-require "rack/mongoid/proxy"
 require "rack/mongoid/middleware/identity_map"
diff --git a/lib/rack/mongoid/middleware/identity_map.rb b/lib/rack/mongoid/middleware/identity_map.rb
index 31a87ad5f3..507cd240b0 100644
--- a/lib/rack/mongoid/middleware/identity_map.rb
+++ b/lib/rack/mongoid/middleware/identity_map.rb
@@ -31,48 +31,7 @@ def initialize(app)
         #
         # @since 2.1.0
         def call(env)
-          begin
-            response = @app.call(env)
-            response[2] = ::Rack::Mongoid::Proxy.new(response[2]) do
-              ::Mongoid::IdentityMap.clear
-            end
-          rescue
-            ::Mongoid::IdentityMap.clear
-            raise
-          end
-          response
-        end
-
-        # Passenger 3 does not execute the block provided to a Rack::BodyProxy
-        # so the identity map never gets cleared. Since there's no streaming
-        # support in it anyways we do not need the proxy functionality.
-        class Passenger
-
-          # Initialize the new middleware.
-          #
-          # @example Init the middleware.
-          #   IdentityMap.new(app)
-          #
-          # @param [ Object ] app The application.
-          #
-          # @since 3.0.11
-          def initialize(app)
-            @app = app
-          end
-
-          # Make the request with the provided environment.
-          #
-          # @example Make the request.
-          #   identity_map.call(env)
-          #
-          # @param [ Object ] env The environment.
-          #
-          # @return [ Array ] The status, headers, and response.
-          #
-          # @since 3.0.11
-          def call(env)
-            ::Mongoid.unit_of_work { @app.call(env) }
-          end
+          ::Mongoid.unit_of_work { @app.call(env) }
         end
       end
     end
diff --git a/spec/rack/mongoid/middleware/identity_map_spec.rb b/spec/rack/mongoid/middleware/identity_map_spec.rb
index 7570cc4a2a..22050c6449 100644
--- a/spec/rack/mongoid/middleware/identity_map_spec.rb
+++ b/spec/rack/mongoid/middleware/identity_map_spec.rb
@@ -20,42 +20,6 @@
 
   describe "#call" do
 
-    module Rack
-      class BodyProxy
-        def initialize(body, &block)
-          @body, @block, @closed = body, block, false
-        end
-
-        def respond_to?(*args)
-          return false if args.first.to_s =~ /^to_ary$/
-          super or @body.respond_to?(*args)
-        end
-
-        def close
-          return if @closed
-          @closed = true
-          begin
-            @body.close if @body.respond_to? :close
-          ensure
-            @block.call
-          end
-        end
-
-        def closed?
-          @closed
-        end
-
-        def each(*args, &block)
-          @body.each(*args, &block)
-        end
-
-        def method_missing(*args, &block)
-          super if args.first.to_s =~ /^to_ary$/
-          @body.__send__(*args, &block)
-        end
-      end
-    end
-
     let(:middleware) do
       klass.new(app)
     end
@@ -79,7 +43,7 @@ def method_missing(*args, &block)
       end
 
       it "returns the call with the body proxy" do
-        result[2].should be_a(Rack::BodyProxy)
+        result.should eq([])
       end
 
       it "clears out the identity map" do