diff --git a/sys/dev/extres/regulator/regulator_fixed.c b/sys/dev/extres/regulator/regulator_fixed.c
index 176d79867e0..05e0a8bb8f4 100644
--- a/sys/dev/extres/regulator/regulator_fixed.c
+++ b/sys/dev/extres/regulator/regulator_fixed.c
@@ -29,11 +29,12 @@ __FBSDID("$FreeBSD$");
 
 #include "opt_platform.h"
 #include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
 #include <sys/conf.h>
 #include <sys/gpio.h>
 #include <sys/kernel.h>
 #include <sys/kobj.h>
-#include <sys/systm.h>
 #include <sys/module.h>
 #include <sys/mutex.h>