diff --git a/plugins/providers/virtualbox/driver/base.rb b/plugins/providers/virtualbox/driver/base.rb
index 8e95cd7f076..7d1739ba26f 100644
--- a/plugins/providers/virtualbox/driver/base.rb
+++ b/plugins/providers/virtualbox/driver/base.rb
@@ -442,8 +442,8 @@ def execute(*command, &block)
             if errored
               raise Vagrant::Errors::VBoxManageError,
                 command: command.inspect,
-                stderr:  r.stderr,
-                stdout:  r.stdout
+                stderr:  r.stderr.to_s.force_encoding("UTF-8"),
+                stdout:  r.stdout.to_s.force_encoding("UTF-8")
             end
           end