diff --git a/dba/patches/1.1.9.sql b/dba/patches/1.1.9.sql
index 056cd100..e3d49113 100644
--- a/dba/patches/1.1.9.sql
+++ b/dba/patches/1.1.9.sql
@@ -1,13 +1,13 @@
 
--- Adding a primary key to the calendar_item table
+-- Make sure that class is set to something, by default PUBLIC.
+-- According to RFC2445, 4.8.1.3.
 
 BEGIN;
 SELECT check_db_revision(1,1,8);
 
-ALTER TABLE calendar_item ADD PRIMARY KEY (user_no, dav_name );
+UPDATE calendar_item SET class = 'PUBLIC' WHERE class IS NULL;
 
-SELECT new_db_revision(1,1,9, 'September' );
+SELECT new_db_revision(1,1,9, 'October' );
 COMMIT;
 ROLLBACK;
 
-VACUUM FULL ANALYZE;
\ No newline at end of file
diff --git a/inc/caldav-PUT-functions.php b/inc/caldav-PUT-functions.php
index 7deee23b..7b2ae3d5 100644
--- a/inc/caldav-PUT-functions.php
+++ b/inc/caldav-PUT-functions.php
@@ -185,6 +185,16 @@ function import_collection( $ics_content, $user_no, $path, $caldav_context ) {
       $dtstamp = $last_modified;
     }
 
+    /*
+     * It seems that some calendar clients don't set a class...
+     * RFC2445, 4.8.1.3:
+     * Default is PUBLIC
+     */  
+    $class = $ic->Get("class");
+    if ( !isset($class) || $class == '' ) {
+      $class = 'PUBLIC'
+    }
+
     $sql .= <<<EOSQL
   INSERT INTO calendar_item (user_no, dav_name, dav_etag, uid, dtstamp, dtstart, dtend, summary, location, class, transp,
                       description, rrule, tz_id, last_modified, url, priority, created, due, percent_complete )
@@ -193,7 +203,7 @@ EOSQL;
 
     $qry = new PgQuery( $sql, $user_no, $event_path, $etag, $ic->Get('uid'), $dtstamp,
                               $ic->Get('dtstart'), $ic->Get('summary'), $ic->Get('location'),
-                              $ic->Get('class'), $ic->Get('transp'), $ic->Get('description'), $ic->Get('rrule'), $ic->Get('tz_id'),
+                              $class, $ic->Get('transp'), $ic->Get('description'), $ic->Get('rrule'), $ic->Get('tz_id'),
                               $last_modified, $ic->Get('url'), $ic->Get('priority'), $ic->Get('created'),
                               $ic->Get('due'), $ic->Get('percent-complete')
                         );
@@ -315,6 +325,17 @@ function putCalendarResource( &$request, $author, $caldav_context ) {
     $dtstamp = $last_modified;
   }
 
+  /*
+   * It seems that some calendar clients don't set a class...
+   * RFC2445, 4.8.1.3:
+   * Default is PUBLIC
+   */  
+  $class = $ic->Get("class");
+  if ( !isset($class) || $class == '' ) {
+    $class = 'PUBLIC'
+  }
+
+
   if ( $put_action_type != 'INSERT' ) {
     $sql .= "DELETE FROM calendar_item WHERE user_no=$request->user_no AND dav_name=".qpg($request->path).";";
   }
@@ -327,7 +348,7 @@ EOSQL;
 
   $qry = new PgQuery( $sql, $request->user_no, $request->path, $etag, $ic->Get('UID'), $dtstamp,
                             $ic->Get('DTSTART'), $ic->Get('SUMMARY'), $ic->Get('LOCATION'),
-                            $ic->Get('CLASS'), $ic->Get('TRANSP'), $ic->Get('DESCRIPTION'), $ic->Get('RRULE'), $ic->Get('TZ_ID'),
+                            $class, $ic->Get('TRANSP'), $ic->Get('DESCRIPTION'), $ic->Get('RRULE'), $ic->Get('TZ_ID'),
                             $last_modified, $ic->Get('URL'), $ic->Get('PRIORITY'), $ic->Get('CREATED'),
                             $ic->Get('DUE'), $ic->Get('PERCENT-COMPLETE'), $ic->Get('STATUS')
                       );