diff --git a/plugins/provisioners/chef/command_builder_windows.rb b/plugins/provisioners/chef/command_builder_windows.rb
index f8add1931..4c5439d62 100644
--- a/plugins/provisioners/chef/command_builder_windows.rb
+++ b/plugins/provisioners/chef/command_builder_windows.rb
@@ -26,7 +26,8 @@ module VagrantPlugins
 
       def win_path(path)
         path.gsub!("/", "\\")
-        "c:#{path}" if path.start_with?("\\")
+        path = "c:#{path}" if path.start_with?("\\")
+        path
       end
     end
   end
diff --git a/test/unit/plugins/provisioners/chef/command_build_windows_spec.rb b/test/unit/plugins/provisioners/chef/command_build_windows_spec.rb
new file mode 100644
index 000000000..5b8d4f325
--- /dev/null
+++ b/test/unit/plugins/provisioners/chef/command_build_windows_spec.rb
@@ -0,0 +1,55 @@
+require_relative "../../../base"
+
+require Vagrant.source_root.join("plugins/provisioners/chef/command_builder_windows")
+
+describe VagrantPlugins::Chef::CommandBuilderWindows do
+
+  let(:machine) { double("machine") }
+  let(:chef_config) { double("chef_config") }
+
+  subject do
+    VagrantPlugins::Chef::CommandBuilderWindows.new(machine, chef_config, :client)
+  end
+
+  before(:each) do
+    allow(chef_config).to receive(:provisioning_path).and_return('/tmp/vagrant-chef-1')
+    allow(chef_config).to receive(:arguments).and_return(nil)
+    allow(chef_config).to receive(:binary_env).and_return(nil)
+    allow(chef_config).to receive(:binary_path).and_return(nil)
+  end
+
+  describe '.initialize' do
+    it 'should raise when chef type is not client or solo' do
+      expect { VagrantPlugins::Chef::CommandBuilderWindows.new(machine, chef_config, :client_bad) }.
+        to raise_error
+    end
+  end
+
+  describe '.build_command' do
+    it "executes the chef-client in PATH by default" do
+      expect(subject.build_command()).to match(/^chef-client/)
+    end
+
+    it "executes the chef-client using full path if binary_path is specified" do
+      allow(chef_config).to receive(:binary_path).and_return(
+        "c:\\opscode\\chef\\bin\\chef-client")
+      expect(subject.build_command()).to match(/^c:\\opscode\\chef\\bin\\chef-client\\chef-client/)
+    end
+
+    it "builds a windows friendly client.rb path" do
+      expect(subject.build_command()).to include(
+        '-c c:\\tmp\\vagrant-chef-1\\client.rb')
+    end
+
+    it "builds a windows friendly solo.json path" do
+      expect(subject.build_command()).to include(
+        '-j c:\\tmp\\vagrant-chef-1\\dna.json')
+    end
+
+    it 'includes Chef arguments if specified' do
+      allow(chef_config).to receive(:arguments).and_return("-l DEBUG")
+      expect(subject.build_command()).to include(
+        '-l DEBUG')
+    end
+  end
+end