diff --git a/plugins/providers/docker/action/create.rb b/plugins/providers/docker/action/create.rb
index 89034b117..6b4122693 100644
--- a/plugins/providers/docker/action/create.rb
+++ b/plugins/providers/docker/action/create.rb
@@ -135,7 +135,7 @@ module VagrantPlugins
               next
             end
 
-            mappings[options[:host]] = options
+            mappings["#{options[:host]}/#{options[:protocol]}"] = options
           end
 
           # Build the results
diff --git a/test/unit/plugins/providers/docker/action/create_test.rb b/test/unit/plugins/providers/docker/action/create_test.rb
new file mode 100644
index 000000000..2b2a9c669
--- /dev/null
+++ b/test/unit/plugins/providers/docker/action/create_test.rb
@@ -0,0 +1,55 @@
+require_relative "../../../../base"
+require_relative "../../../../../../plugins/providers/docker/action/create"
+
+describe VagrantPlugins::DockerProvider::Action::Create do
+  include_context "unit"
+  include_context "virtualbox"
+
+  let(:sandbox) { isolated_environment }
+
+  let(:iso_env) do
+    # We have to create a Vagrantfile so there is a root path
+    sandbox.vagrantfile("")
+    sandbox.create_vagrant_env
+  end
+
+  let(:machine) do
+    iso_env.machine(iso_env.machine_names[0], :virtualbox).tap do |m|
+      m.provider.stub(driver: driver)
+    end
+  end
+
+  let(:env)    {{ machine: machine, ui: machine.ui, root_path: Pathname.new(".") }}
+  let(:app)    { lambda { |*args| }}
+  let(:driver) { double("driver", create: "abcd1234") }
+
+  subject { described_class.new(app, env) }
+
+  after do
+    sandbox.close
+  end
+
+  describe "#call" do
+    it "calls the next action in the chain" do
+      called = false
+      app = ->(*args) { called = true }
+
+      action = described_class.new(app, env)
+      action.call(env)
+
+      expect(called).to eq(true)
+    end
+  end
+
+  describe "#forwarded_ports" do
+    it "does not clobber ports with different protocols" do
+      subject.instance_variable_set(:@machine, machine)
+      machine.config.vm.network "forwarded_port", guest: 8125, host: 8125, protocol: "tcp"
+      machine.config.vm.network "forwarded_port", guest: 8125, host: 8125, protocol: "udp"
+
+      result = subject.forwarded_ports(false)
+
+      expect(result).to eq(["8125:8125", "8125:8125/udp"])
+    end
+  end
+end