diff --git a/smmapdfw/smmapd/containers.h b/smmapdfw/smmapd/containers.h
index 4d8179f..0a57b77 100644
--- a/smmapdfw/smmapd/containers.h
+++ b/smmapdfw/smmapd/containers.h
@@ -29,6 +29,7 @@
 
 struct classes_s {
   class_descriptor_t *descr;
+  char *alias;
   int id;
   void *handle;
   struct classes_s *next;