diff --git a/sys/conf/files.pc98 b/sys/conf/files.pc98
index 70f99a24114..0ebe2ad8876 100644
--- a/sys/conf/files.pc98
+++ b/sys/conf/files.pc98
@@ -184,6 +184,7 @@ i386/i386/nexus.c		standard
 i386/i386/perfmon.c		optional perfmon
 i386/i386/pmap.c		standard
 i386/i386/ptrace_machdep.c	standard
+i386/i386/stack_machdep.c	optional ddb | stack
 i386/i386/support.s		standard
 i386/i386/swtch.s		standard
 i386/i386/sys_machdep.c		standard
diff --git a/sys/pc98/include/stack.h b/sys/pc98/include/stack.h
new file mode 100644
index 00000000000..2f854615f31
--- /dev/null
+++ b/sys/pc98/include/stack.h
@@ -0,0 +1,6 @@
+/*-
+ * This file is in the public domain.
+ */
+/* $FreeBSD$ */
+
+#include <i386/stack.h>