diff --git a/booking.prices.inc b/booking.prices.inc
index 1c06293..5ad58dc 100644
--- a/booking.prices.inc
+++ b/booking.prices.inc
@@ -115,7 +115,7 @@ function booking_price_form($node, &$form_state, $create, $editid = 0)
 	else
 	{	
 		//verify that $editid is a number
-		if preg_match(! ('/^[0-9]+$/', $editid)) {
+		if (! preg_match('/^[0-9]+$/', $editid)) {
 			drupal_set_message("Error: Invalid price ID supplied. Unable to update price entry.", 'error', FALSE);
 			drupal_goto('admin/config/booking/prices');
 			return "";