diff --git a/sys/i386/i386/perfmon.c b/sys/i386/i386/perfmon.c
index 3b446d67f083..1e64c3b89e4a 100644
--- a/sys/i386/i386/perfmon.c
+++ b/sys/i386/i386/perfmon.c
@@ -33,6 +33,7 @@
 #include <sys/systm.h>
 #include <sys/conf.h>
 #include <sys/fcntl.h>
+#include <sys/kernel.h>
 
 #ifndef SMP
 #include <machine/cputypes.h>