diff --git a/sys/amd64/amd64/sys_machdep.c b/sys/amd64/amd64/sys_machdep.c
index a3716a35444..b715663ea92 100644
--- a/sys/amd64/amd64/sys_machdep.c
+++ b/sys/amd64/amd64/sys_machdep.c
@@ -36,11 +36,13 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_capsicum.h"
+#include "opt_ktrace.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/capsicum.h>
 #include <sys/kernel.h>
+#include <sys/ktrace.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/mutex.h>
diff --git a/sys/arm/arm/sys_machdep.c b/sys/arm/arm/sys_machdep.c
index fc424d0fad3..718c5a06318 100644
--- a/sys/arm/arm/sys_machdep.c
+++ b/sys/arm/arm/sys_machdep.c
@@ -35,10 +35,12 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_capsicum.h"
+#include "opt_ktrace.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/capsicum.h>
+#include <sys/ktrace.h>
 #include <sys/proc.h>
 #include <sys/sysproto.h>
 #include <sys/syscall.h>
diff --git a/sys/i386/i386/sys_machdep.c b/sys/i386/i386/sys_machdep.c
index eeff4b28069..04456b55da5 100644
--- a/sys/i386/i386/sys_machdep.c
+++ b/sys/i386/i386/sys_machdep.c
@@ -36,10 +36,12 @@ __FBSDID("$FreeBSD$");
 
 #include "opt_capsicum.h"
 #include "opt_kstack_pages.h"
+#include "opt_ktrace.h"
 
 #include <sys/param.h>
 #include <sys/capsicum.h>
 #include <sys/systm.h>
+#include <sys/ktrace.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
 #include <sys/mutex.h>