diff --git a/sys/pc98/cbus/fdc.c b/sys/pc98/cbus/fdc.c
index 8b9b18ec248..c02e7fc9699 100644
--- a/sys/pc98/cbus/fdc.c
+++ b/sys/pc98/cbus/fdc.c
@@ -56,15 +56,17 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
-#include <sys/kernel.h>
 #include <sys/bio.h>
 #include <sys/bus.h>
 #include <sys/conf.h>
-#include <sys/disklabel.h>
 #include <sys/devicestat.h>
+#include <sys/disklabel.h>
 #include <sys/fcntl.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/module.h>
+#include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/syslog.h>
 
diff --git a/sys/pc98/pc98/fd.c b/sys/pc98/pc98/fd.c
index 8b9b18ec248..c02e7fc9699 100644
--- a/sys/pc98/pc98/fd.c
+++ b/sys/pc98/pc98/fd.c
@@ -56,15 +56,17 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
-#include <sys/kernel.h>
 #include <sys/bio.h>
 #include <sys/bus.h>
 #include <sys/conf.h>
-#include <sys/disklabel.h>
 #include <sys/devicestat.h>
+#include <sys/disklabel.h>
 #include <sys/fcntl.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/module.h>
+#include <sys/mutex.h>
 #include <sys/proc.h>
 #include <sys/syslog.h>