diff --git a/CHANGELOG.md b/CHANGELOG.md
index 500e11be2..62647d87e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,9 @@ BACKWARDS INCOMPATIBILITY:
   - `config.vm.graceful_halt_retry_*` settings are gone. Instead, a single
     timeout is now used to wait for a graceful halt to work, specified
     by `config.vm.graceful_halt_timeout`.
+  - The ':extra' flag to shared folders for specifying arbitrary mount
+    options has been replaced with the `:mount_options` flag, which is now
+    an array of mount options.
 
 FEATURES:
 
diff --git a/plugins/guests/linux/cap/mount_nfs.rb b/plugins/guests/linux/cap/mount_nfs.rb
index 1abee3bdf..33e9fd798 100644
--- a/plugins/guests/linux/cap/mount_nfs.rb
+++ b/plugins/guests/linux/cap/mount_nfs.rb
@@ -18,8 +18,14 @@ module VagrantPlugins
             # Mount
             hostpath = opts[:hostpath].dup
             hostpath.gsub!("'", "'\\\\''")
-            mount_command = "mount -o udp,vers=#{opts[:nfs_version]} #{ip}:'#{hostpath}' #{expanded_guest_path}"
 
+            # Figure out any options
+            mount_opts = ["vers=#{opts[:nfs_version]}", "udp"]
+            if opts[:mount_options]
+              mount_opts = opts[:mount_options].dup
+            end
+
+            mount_command = "mount -o '#{mount_opts.join(",")}' #{ip}:'#{hostpath}' #{expanded_guest_path}"
             retryable(:on => Vagrant::Errors::LinuxNFSMountFailed, :tries => 5, :sleep => 2) do
               machine.communicate.sudo(mount_command,
                                        :error_class => Vagrant::Errors::LinuxNFSMountFailed)
diff --git a/plugins/guests/linux/cap/mount_virtualbox_shared_folder.rb b/plugins/guests/linux/cap/mount_virtualbox_shared_folder.rb
index 0c04d5f6b..25119571a 100644
--- a/plugins/guests/linux/cap/mount_virtualbox_shared_folder.rb
+++ b/plugins/guests/linux/cap/mount_virtualbox_shared_folder.rb
@@ -8,7 +8,10 @@ module VagrantPlugins
 
           # Determine the permission string to attach to the mount command
           mount_options = "-o uid=`id -u #{options[:owner]}`,gid=`getent group #{options[:group]} | cut -d: -f3`"
-          mount_options += ",#{options[:extra]}" if options[:extra]
+          if options[:mount_options]
+            mount_options += ",#{options[:mount_options].join(",")}"
+          end
+
           mount_command = "mount -t vboxsf #{mount_options} #{name} #{expanded_guest_path}"
 
           # Create the guest path if it doesn't exist
diff --git a/plugins/guests/solaris/cap/mount_virtualbox_shared_folder.rb b/plugins/guests/solaris/cap/mount_virtualbox_shared_folder.rb
index dacbee451..6ddf9d180 100644
--- a/plugins/guests/solaris/cap/mount_virtualbox_shared_folder.rb
+++ b/plugins/guests/solaris/cap/mount_virtualbox_shared_folder.rb
@@ -16,7 +16,10 @@ module VagrantPlugins
 
           # Mount the folder with the proper owner/group
           mount_options = "-o uid=`#{id_cmd} -u #{owner}`,gid=`#{id_cmd} -g #{group}`"
-          mount_options += ",#{options[:extra]}" if options[:extra]
+          if options[:mount_options]
+            mount_options += ",#{options[:mount_options].join(",")}"
+          end
+
           machine.communicate.execute("#{machine.config.solaris.suexec_cmd} /sbin/mount -F vboxfs #{mount_options} #{name} #{guestpath}")
 
           # chown the folder to the proper owner/group
diff --git a/plugins/guests/solaris11/cap/mount_virtualbox_shared_folder.rb b/plugins/guests/solaris11/cap/mount_virtualbox_shared_folder.rb
index df0ae4af7..543350d17 100644
--- a/plugins/guests/solaris11/cap/mount_virtualbox_shared_folder.rb
+++ b/plugins/guests/solaris11/cap/mount_virtualbox_shared_folder.rb
@@ -20,7 +20,10 @@ module VagrantPlugins
 
           # Mount the folder with the proper owner/group
           mount_options = "-o uid=`#{id_cmd} -u #{owner}`,gid=`#{id_cmd} -g #{group}`"
-          mount_options += ",#{options[:extra]}" if options[:extra]
+          if options[:mount_options]
+            mount_options += ",#{options[:mount_options].join(",")}"
+          end
+
           machine.communicate.execute("#{machine.config.solaris11.suexec_cmd} /sbin/mount -F vboxfs #{mount_options} #{name} #{guestpath}")
 
           # chown the folder to the proper owner/group
diff --git a/plugins/kernel_v2/config/vm.rb b/plugins/kernel_v2/config/vm.rb
index 89978cd39..019a6e6dd 100644
--- a/plugins/kernel_v2/config/vm.rb
+++ b/plugins/kernel_v2/config/vm.rb
@@ -379,6 +379,10 @@ module VagrantPlugins
                                :path => options[:hostpath])
             end
           end
+
+          if options[:mount_options] && !options[:mount_options].is_a?(Array)
+            errors << I18n.t("vagrant.config.vm.shared_folder_mount_options_array")
+          end
         end
 
         if has_nfs
diff --git a/templates/locales/en.yml b/templates/locales/en.yml
index b23e09fd9..961b9d3e9 100644
--- a/templates/locales/en.yml
+++ b/templates/locales/en.yml
@@ -719,6 +719,9 @@ en:
         shared_folder_nfs_owner_group: |-
           Shared folder that have NFS enabled do no support owner/group
           attributes. Host path: %{path}
+        shared_folder_mount_options_array: |-
+          Shared folder mount options specified by 'mount_options' must
+          be an array of options.
 
 #-------------------------------------------------------------------------------
 # Translations for commands. e.g. `vagrant x`