diff --git a/booking.helper.inc b/booking.helper.inc
index aacf1cf..aa4fef1 100644
--- a/booking.helper.inc
+++ b/booking.helper.inc
@@ -53,9 +53,12 @@ function _booking_ucname($string) {
 	}	
 	 
   if ($prefixes) {
+		watchdog('booking_debug', "Checking prefixes");
+		preg_match("/\b($prefixes)(\w)/", $string, $matches);
+		watchdog('booking_debug', "<pre>Prefixes match test: \n@info</pre>", array('@info' => print_r( $matches, true)));
 		// capitalize letter after certain name prefixes e.g 'Mc'
 		//$string = preg_replace("/\\b($prefixes)(\\w)/e", '"$1".strtoupper("$2")', $string);
-		$string = preg_replace_callback('/\\b($prefixes)(\\w)/', function ($m) { 
+		$string = preg_replace_callback("/\b($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);