diff --git a/lib/vagrant-cachier/provision_ext.rb b/lib/vagrant-cachier/provision_ext.rb
index e8cc8b3..ee14d10 100644
--- a/lib/vagrant-cachier/provision_ext.rb
+++ b/lib/vagrant-cachier/provision_ext.rb
@@ -52,7 +52,7 @@ module VagrantPlugins
           end
 
           def cache_root
-            @cache_root ||= case @env[:machine].config.cache.scope
+            @cache_root ||= case @env[:machine].config.cache.scope.to_sym
               when :box
                 @env[:home_path].join('cache', @env[:machine].box.name)
               when :machine