diff --git a/lib/linux_admin/registration_system.rb b/lib/linux_admin/registration_system.rb
index 55d7612..975c60d 100644
--- a/lib/linux_admin/registration_system.rb
+++ b/lib/linux_admin/registration_system.rb
@@ -47,7 +47,8 @@ def self.white_list_methods
     private_class_method :white_list_methods
 
     def install_server_certificate(server, cert_path)
-      host = server.start_with?("http") ? URI.parse(server).host : server
+      require 'uri'
+      host = server.start_with?("http") ? ::URI.parse(server).host : server
 
       LinuxAdmin::Rpm.upgrade("http://#{host}/#{cert_path}")
     end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index eaecf64..1243e56 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -85,6 +85,7 @@
   end
 end
 
+require 'rspec/support/differ'
 require 'linux_admin'
 
 def etc_issue_contains(contents)