diff --git a/plugins/providers/virtualbox/config.rb b/plugins/providers/virtualbox/config.rb
index aed1c692c..5bb1e754b 100644
--- a/plugins/providers/virtualbox/config.rb
+++ b/plugins/providers/virtualbox/config.rb
@@ -143,7 +143,7 @@ module VagrantPlugins
       def validate(machine)
         errors = _detected_errors
 
-        valid_events = ["pre-import", "pre-boot", "post-boot"]
+        valid_events = ["pre-import", "pre-boot", "post-boot", "post-comm"]
         @customizations.each do |event, _|
           if !valid_events.include?(event)
             errors << I18n.t(