diff --git a/src/engine/gnc-engine.h b/src/engine/gnc-engine.h
index 096de6bafd..9ccd412187 100644
--- a/src/engine/gnc-engine.h
+++ b/src/engine/gnc-engine.h
@@ -39,9 +39,12 @@ typedef struct gnc_commodity_s       gnc_commodity;
 typedef struct gnc_commodity_table_s gnc_commodity_table;
 
 typedef GList                  AccountList;
+typedef GList                  BookList;
 typedef GList                  SplitList;
 typedef GList                  TransList;
 
+typedef GList                  AccountGUIDList;
+typedef GList                  BookGUIDList;
 
 typedef void (* gnc_engine_init_hook_t)(int, char **);