diff --git a/plugins/providers/virtualbox/driver/version_4_3.rb b/plugins/providers/virtualbox/driver/version_4_3.rb
index f895739d3..b77b2a4f9 100644
--- a/plugins/providers/virtualbox/driver/version_4_3.rb
+++ b/plugins/providers/virtualbox/driver/version_4_3.rb
@@ -610,6 +610,9 @@ module VagrantPlugins
         def share_folders(folders)
           folders.each do |folder|
             hostpath = folder[:hostpath]
+            if Vagrant::Util::Platform.windows?
+              hostpath = Vagrant::Util::Platform.windows_unc_path(hostpath)
+            end
             args = ["--name",
               folder[:name],
               "--hostpath",
diff --git a/plugins/providers/virtualbox/driver/version_5_0.rb b/plugins/providers/virtualbox/driver/version_5_0.rb
index d13330c00..75a71c4f1 100644
--- a/plugins/providers/virtualbox/driver/version_5_0.rb
+++ b/plugins/providers/virtualbox/driver/version_5_0.rb
@@ -611,14 +611,9 @@ module VagrantPlugins
         def share_folders(folders)
           folders.each do |folder|
             hostpath = folder[:hostpath]
-
-=begin
-            # Removed for GH-5933 until further research.
             if Vagrant::Util::Platform.windows?
               hostpath = Vagrant::Util::Platform.windows_unc_path(hostpath)
             end
-=end
-
             args = ["--name",
               folder[:name],
               "--hostpath",