diff --git a/sys/ddb/db_command.c b/sys/ddb/db_command.c
index 3629dafca3bd..c560b2004574 100644
--- a/sys/ddb/db_command.c
+++ b/sys/ddb/db_command.c
@@ -23,7 +23,7 @@
  * any improvements or extensions that they make and grant Carnegie the
  * rights to redistribute these changes.
  *
- *	$Id: db_command.c,v 1.19 1996/08/27 19:46:28 pst Exp $
+ *	$Id: db_command.c,v 1.20 1996/09/14 09:13:13 bde Exp $
  */
 
 /*
@@ -49,6 +49,10 @@
 /*
  * Exported global variables
  */
+/*
+ * XXX when db_command is actually used, it will be generated by the linker.
+ * Then it should be declared extern.
+ */
 struct linker_set	db_cmd_set;
 boolean_t	db_cmd_loop_done;
 db_addr_t	db_dot;
@@ -56,7 +60,7 @@ jmp_buf		db_jmpbuf;
 db_addr_t	db_last_addr;
 db_addr_t	db_prev;
 db_addr_t	db_next;
-struct linker_set	db_show_cmd_set;
+extern struct linker_set	db_show_cmd_set;
 
 static db_cmdfcn_t	db_fncall;
 static db_cmdfcn_t	db_gdb;