diff --git a/sys/platform/vkernel/conf/files b/sys/platform/vkernel/conf/files
index 7f7d97f..f33af7b 100644
--- a/sys/platform/vkernel/conf/files
+++ b/sys/platform/vkernel/conf/files
@@ -57,8 +57,8 @@ dev/virtual/net/if_vke.c		optional	vke
 platform/vkernel/i386/global.s		standard
 platform/vkernel/i386/swtch.s		standard
 platform/vkernel/i386/npx.c		mandatory       npx
-platform/vkernel/i386/db_interface.c	standard
-platform/vkernel/i386/db_trace.c	standard
+platform/vkernel/i386/db_interface.c	optional	ddb
+platform/vkernel/i386/db_trace.c	optional	ddb
 platform/vkernel/i386/vm_machdep.c	standard
 platform/vkernel/i386/cpu_regs.c	standard
 platform/vkernel/i386/userldt.c		standard