diff --git a/util/ceg/ce_back/as_back/back.h b/util/ceg/ce_back/as_back/back.h
index d72323b39..54f7f82da 100644
--- a/util/ceg/ce_back/as_back/back.h
+++ b/util/ceg/ce_back/as_back/back.h
@@ -47,6 +47,7 @@
 #define set_local_visible	B_stlocvis
 #define symbol_definition	B_symdef
 #define switchseg		B_switchseg
+#define not_implemented		B_not_implemented
 
 extern File *codefile;
 
diff --git a/util/ceg/ce_back/obj_back/back.h b/util/ceg/ce_back/obj_back/back.h
index a32bbf8a4..36d821269 100644
--- a/util/ceg/ce_back/obj_back/back.h
+++ b/util/ceg/ce_back/obj_back/back.h
@@ -46,6 +46,7 @@
 #define set_global_visible	B_stglobvis
 #define set_local_visible	B_stlocvis
 #define symbol_definition	B_symdef
+#define not_implemented		B_not_implemented
 
 
 /* Numbering of the segments and some global constants */