diff --git a/plugins/libkolab/lib/kolab_format_event.php b/plugins/libkolab/lib/kolab_format_event.php
index a7cf2d42..16500246 100644
--- a/plugins/libkolab/lib/kolab_format_event.php
+++ b/plugins/libkolab/lib/kolab_format_event.php
@@ -49,29 +49,6 @@ class kolab_format_event extends kolab_format_xcal
         $this->_scheduling_properties = self::$scheduling_properties;
     }
 
-    /**
-     * Clones into an instance of libcalendaring's extended EventCal class
-     *
-     * @return mixed EventCal object or false on failure
-     */
-    public function to_libcal()
-    {
-        static $error_logged = false;
-
-        if (class_exists('kolabcalendaring')) {
-            return new EventCal($this->obj);
-        }
-        else if (!$error_logged) {
-            $error_logged = true;
-            rcube::raise_error(array(
-                'code' => 900, 'type' => 'php',
-                'message' => "required kolabcalendaring module not found"
-            ), true);
-        }
-
-        return false;
-    }
-
     /**
      * Set event properties to the kolabformat object
      *
diff --git a/plugins/libkolab/lib/kolab_format_xcal.php b/plugins/libkolab/lib/kolab_format_xcal.php
index a9dd70c8..69a273a2 100644
--- a/plugins/libkolab/lib/kolab_format_xcal.php
+++ b/plugins/libkolab/lib/kolab_format_xcal.php
@@ -711,4 +711,27 @@ abstract class kolab_format_xcal extends kolab_format
 
         return $reschedule;
     }
-}
\ No newline at end of file
+
+    /**
+     * Clones into an instance of libcalendaring's extended EventCal class
+     *
+     * @return mixed EventCal object or false on failure
+     */
+    public function to_libcal()
+    {
+        static $error_logged = false;
+
+        if (class_exists('kolabcalendaring')) {
+            return new EventCal($this->obj);
+        }
+        else if (!$error_logged) {
+            $error_logged = true;
+            rcube::raise_error(array(
+                'code'    => 900,
+                'message' => "required kolabcalendaring module not found"
+            ), true);
+        }
+
+        return false;
+    }
+}