Warning: Call-time pass-by-reference has been deprecated

After enabling tcontact, I got the following error:
Warning: Call-time pass-by-reference has been deprecated in /sites/default/modules/tcontact/tcontact.module on line 44

After doing some research, I changed
_tcontact_admin_edit(&$form, $form_state, $form_id);
to
_tcontact_admin_edit($form, $form_state, $form_id);

and that did the trick. My PHP knowledge is not enough to know if this is the right way to do it though and to make sure I didn't break anything else in the process.