diff --git a/test/unit/base.rb b/test/unit/base.rb
index df57435ad..6866f0f36 100644
--- a/test/unit/base.rb
+++ b/test/unit/base.rb
@@ -30,6 +30,8 @@ RSpec.configure do |c|
 
   if Vagrant::Util::Platform.windows?
     c.filter_run_excluding :skip_windows
+  else
+    c.filter_run_excluding :windows
   end
 end
 
diff --git a/test/unit/vagrant/util/platform_test.rb b/test/unit/vagrant/util/platform_test.rb
new file mode 100644
index 000000000..3e980937f
--- /dev/null
+++ b/test/unit/vagrant/util/platform_test.rb
@@ -0,0 +1,13 @@
+require File.expand_path("../../../base", __FILE__)
+
+require "vagrant/util/platform"
+
+describe Vagrant::Util::Platform do
+  subject { described_class }
+
+  describe "#fs_real_path" do
+    it "fixes drive letters on Windows", :windows do
+      expect(described_class.fs_real_path("c:/foo").to_s).to eql("C:/foo")
+    end
+  end
+end