diff --git a/plugins/synced_folders/smb/config.rb b/plugins/synced_folders/smb/config.rb
new file mode 100644
index 000000000..d853092ac
--- /dev/null
+++ b/plugins/synced_folders/smb/config.rb
@@ -0,0 +1,23 @@
+require "vagrant"
+
+module VagrantPlugins
+  module SyncedFolderSMB
+    class Config < Vagrant.plugin("2", :config)
+      attr_accessor :functional
+
+      def initialize
+        super
+
+        @functional = UNSET_VALUE
+      end
+
+      def finalize!
+        @functional = true if @functional == UNSET_VALUE
+      end
+
+      def to_s
+        "SMB"
+      end
+    end
+  end
+end
diff --git a/plugins/synced_folders/smb/plugin.rb b/plugins/synced_folders/smb/plugin.rb
index 0e6370e29..bfb58a5b2 100644
--- a/plugins/synced_folders/smb/plugin.rb
+++ b/plugins/synced_folders/smb/plugin.rb
@@ -12,6 +12,11 @@ module VagrantPlugins
       Windows or macOS and share them to guest machines.
       EOF
 
+      config("smb") do
+        require_relative "config"
+        Config
+      end
+
       synced_folder("smb", 7) do
         require_relative "synced_folder"
         init!