diff --git a/src/post_modules/GTK/source/gtkcalendar.pre b/src/post_modules/GTK/source/gtkcalendar.pre
index b3698b995071b6858194be7ced4d02875ee8594f..84497c6e3a04de4f9a8bc2ad59debfa51e3e5be4 100644
--- a/src/post_modules/GTK/source/gtkcalendar.pre
+++ b/src/post_modules/GTK/source/gtkcalendar.pre
@@ -44,6 +44,7 @@ mapping get_date()
   push_int( m );
   push_text("day");
   push_int( d );
+  f_aggregate_mapping( 6 );
 }
 
 void freeze();