diff --git a/lib/vagrant-cachier/action/configure_bucket_root.rb b/lib/vagrant-cachier/action/configure_bucket_root.rb
index 0630378..ee855f3 100644
--- a/lib/vagrant-cachier/action/configure_bucket_root.rb
+++ b/lib/vagrant-cachier/action/configure_bucket_root.rb
@@ -14,6 +14,7 @@ module VagrantPlugins
 
           if !env[:cache_buckets_folder_configured] && env[:machine].config.cache.enabled?
             setup_buckets_folder
+            setup_omnibus_cache_folder
             env[:cache_buckets_folder_configured] = true
           end
 
@@ -21,17 +22,27 @@ module VagrantPlugins
         end
 
         def setup_buckets_folder
-          FileUtils.mkdir_p(cache_root.to_s) unless cache_root.exist?
+          FileUtils.mkdir_p(host_cache_root.to_s) unless host_cache_root.exist?
 
           synced_folder_opts = {id: "vagrant-cache"}
           synced_folder_opts.merge!(@env[:machine].config.cache.synced_folder_opts || {})
 
-          @env[:machine].config.vm.synced_folder cache_root, '/tmp/vagrant-cache', synced_folder_opts
+          @env[:machine].config.vm.synced_folder host_cache_root, guest_cache_root, synced_folder_opts
           @env[:cache_dirs] = []
         end
 
-        def cache_root
-          @cache_root ||= case @env[:machine].config.cache.scope.to_sym
+        def setup_omnibus_cache_folder
+          # unfortunately vagrant-omnibus hooks in before our buckets are installed, yet
+          # this is early enough to tell it to download to the vagrant-omnibus pseudo bucket
+          if @env[:machine].config.cache.auto_detect && omnibus_plugin_detected? && omnibus_plugin_enabled?
+            omnibus_pseudo_bucket = host_cache_root.join('vagrant_omnibus')
+            FileUtils.mkdir(omnibus_pseudo_bucket.to_s) unless omnibus_pseudo_bucket.exist?
+            ENV['OMNIBUS_DOWNLOAD_DIR'] ||= "#{guest_cache_root}/vagrant_omnibus"
+          end
+        end
+
+        def host_cache_root
+          @host_cache_root ||= case @env[:machine].config.cache.scope.to_sym
             when :box
               @env[:home_path].join('cache', @env[:machine].box.name)
             when :machine
@@ -40,6 +51,18 @@ module VagrantPlugins
               raise "Unknown cache scope: '#{@env[:machine].config.cache.scope}'"
           end
         end
+
+        def guest_cache_root
+          '/tmp/vagrant-cache'
+        end
+
+        def omnibus_plugin_detected?
+          defined?(VagrantPlugins::Omnibus::Plugin)
+        end
+
+        def omnibus_plugin_enabled?
+          @env[:machine].config.omnibus.chef_version != nil
+        end
       end
     end
   end