diff --git a/plugins/providers/virtualbox/action/forward_ports.rb b/plugins/providers/virtualbox/action/forward_ports.rb
index 0afc71115..97524b75e 100644
--- a/plugins/providers/virtualbox/action/forward_ports.rb
+++ b/plugins/providers/virtualbox/action/forward_ports.rb
@@ -32,7 +32,8 @@ module VagrantPlugins
           # approach.
           guest_port_mapping = {}
           @env[:machine].config.vm.forwarded_ports.each do |options|
-            guest_port_mapping[options[:guestport]] = options
+            key = options[:protocol].to_s + options[:guestport].to_s
+            guest_port_mapping[key] = options
           end
 
           # Return the values, since the order doesn't really matter