diff --git a/calendar/inc/class.boical.inc.php b/calendar/inc/class.boical.inc.php
index 4d3430e9ed..42a79b9aa1 100644
--- a/calendar/inc/class.boical.inc.php
+++ b/calendar/inc/class.boical.inc.php
@@ -788,6 +788,15 @@
 							break;
 					}
 					break;
+
+				//Syncevolution compatibility	
+				case 'patrick ohly':
+					$this->supportedFields = $defaultFields + array(
+						'participants' => 'participants',
+						'owner'        => 'owner',
+						'category'     => 'category',
+					);
+					break;
 					
 				case 'file':	// used outside of SyncML, eg. by the calendar itself ==> all possible fields
 					$this->supportedFields = $defaultFields + array(