diff --git a/booking.emails.inc b/booking.emails.inc
index b8a6eae..5d929e2 100644
--- a/booking.emails.inc
+++ b/booking.emails.inc
@@ -91,7 +91,7 @@ function booking_manual_email()
 			'booking_fully_paid' => $data->booking_payment_complete == 'Y' ? 'Yes' : 'No',
 			'welfare_required' => $data->booking_welfare_required == 'Y' ? 'Yes' : 'No',
 			'travel_form' => $data->tid > 0 ? 'Yes' : 'No',
-			'#attributes' => array('id' => array($class)),
+			'#attributes' => array('class' => array($class)),
 		);
 		
 		if (variable_get('booking_enable_studygroups', 0) == 1)