diff --git a/booking.helper.inc b/booking.helper.inc
index 3530a22..aacf1cf 100644
--- a/booking.helper.inc
+++ b/booking.helper.inc
@@ -55,7 +55,10 @@ function _booking_ucname($string) {
   if ($prefixes) {
 		// capitalize letter after certain name prefixes e.g 'Mc'
 		//$string = preg_replace("/\\b($prefixes)(\\w)/e", '"$1".strtoupper("$2")', $string);
-		$string = preg_replace_callback('/\\b($prefixes)(\\w)/', function ($m) { return $m[1] . strtoupper($m[2]); }, $string);
+		$string = preg_replace_callback('/\\b($prefixes)(\\w)/', function ($m) { 
+			watchdog('booking_debug', "<pre>Prefixes match: \n@info</pre>", array('@info' => print_r( $m, true)));
+			return $m[1] . strtoupper($m[2]); 
+		}, $string);
 	}
 	if ($suffixes) {
 		// decapitalize certain word suffixes e.g. 's