diff --git a/lib/webmock/http_lib_adapters/net_http.rb b/lib/webmock/http_lib_adapters/net_http.rb
index ed62ed3ec..dee0dd173 100644
--- a/lib/webmock/http_lib_adapters/net_http.rb
+++ b/lib/webmock/http_lib_adapters/net_http.rb
@@ -74,6 +74,12 @@ def socket_type_with_webmock
       end
       alias_method :socket_type_without_webmock, :socket_type
       alias_method :socket_type, :socket_type_with_webmock
+
+      if ::RUBY_VERSION =~ /1.8/
+        def const_defined?(name)
+          super || self.superclass.const_defined?(name)
+        end
+      end
     end
 
     def request_with_webmock(request, body = nil, &block)
diff --git a/spec/net_http_spec.rb b/spec/net_http_spec.rb
index bb5e4324e..91bd2eb91 100644
--- a/spec/net_http_spec.rb
+++ b/spec/net_http_spec.rb
@@ -11,6 +11,10 @@
 
   let(:port){ WebMockServer.instance.port }
 
+  it "should still have const Get defined on replaced Net::HTTP" do
+    Object.const_get("Net").const_get("HTTP").const_defined?("Get").should be_true
+  end
+
   it "should work with block provided" do
     stub_http_request(:get, "www.example.com").to_return(:body => "abc"*100000)
     Net::HTTP.start("www.example.com") { |query| query.get("/") }.body.should == "abc"*100000