diff --git a/module/os/freebsd/zfs/arc_os.c b/module/os/freebsd/zfs/arc_os.c
index 7415be9192..b3deff0f0c 100644
--- a/module/os/freebsd/zfs/arc_os.c
+++ b/module/os/freebsd/zfs/arc_os.c
@@ -46,6 +46,7 @@
 #include <sys/aggsum.h>
 #include <sys/vnode.h>
 #include <cityhash.h>
+#include <machine/vmparam.h>
 
 extern struct vfsops zfs_vfsops;