diff --git a/lib/vagrant/plugin/v2/synced_folder.rb b/lib/vagrant/plugin/v2/synced_folder.rb
index 851b1ea05..bf02ec2f5 100644
--- a/lib/vagrant/plugin/v2/synced_folder.rb
+++ b/lib/vagrant/plugin/v2/synced_folder.rb
@@ -29,14 +29,16 @@ module Vagrant
             c = lambda do |h|
               h.keys.each do |k|
                 if h[k].is_a?(Hash)
-                  h[k] = c.call(h[k].to_h)
+                  h[k] = c.call(h[k].to_h.clone)
                 end
               end
               h
             end
             h = c.call(super)
             h.values.each do |f|
-              f.delete(:plugin)
+              f.values.each do |g|
+                g.delete(:plugin)
+              end
             end
             h
           end
diff --git a/test/unit/vagrant/plugin/v2/synced_folder_test.rb b/test/unit/vagrant/plugin/v2/synced_folder_test.rb
new file mode 100644
index 000000000..d02f0eb68
--- /dev/null
+++ b/test/unit/vagrant/plugin/v2/synced_folder_test.rb
@@ -0,0 +1,46 @@
+require File.expand_path("../../../../base", __FILE__)
+
+describe Vagrant::Plugin::V2::SyncedFolder::Collection do
+  include_context "unit"
+
+  let(:folders) { described_class[
+    :nfs=>
+      {"/other"=>
+        {:type=>:nfs, :guestpath=>"/other", :hostpath=>"/other", :disabled=>false, :__vagrantfile=>true, plugin:"someclass"},
+       "/tests"=>
+        {:type=>:nfs, :guestpath=>"/tests", :hostpath=>"/tests", :disabled=>false, :__vagrantfile=>true, plugin:"someclass"}},
+    :virtualbox=>
+      {"/vagrant"=>
+        {:guestpath=>"/vagrant", :hostpath=>"/vagrant", :disabled=>false, :__vagrantfile=>true, plugin:"someotherclass"}}
+  ]}
+  
+  describe "#types" do
+    it "gets all the types of synced folders" do 
+      expect(folders.types).to eq([:nfs, :virtualbox])
+    end
+  end
+
+  describe "#type" do
+    it "returns the plugin for a type" do 
+      expect(folders.type(:nfs)).to eq("someclass")
+      expect(folders.type(:virtualbox)).to eq("someotherclass")
+    end
+  end
+
+  describe "to_h" do
+    it "removed plugin key" do 
+      original_folders = folders
+      folders_h = folders.to_h
+      folders_h.values.each do |v|
+        v.values.each do |w|
+          expect(w).not_to include(:plugin)
+        end
+      end
+      original_folders.values.each do |v|
+        v.values.each do |w|
+          expect(w).to include(:plugin)
+        end
+      end
+    end
+  end
+end