diff --git a/sys/sun4v/sun4v/mp_machdep.c b/sys/sun4v/sun4v/mp_machdep.c
index acf91c3cb3f..5c13b328eb2 100644
--- a/sys/sun4v/sun4v/mp_machdep.c
+++ b/sys/sun4v/sun4v/mp_machdep.c
@@ -68,6 +68,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mutex.h>
 #include <sys/pcpu.h>
 #include <sys/proc.h>
+#include <sys/sched.h>
 #include <sys/smp.h>
 
 #include <vm/vm.h>