diff --git a/usr.bin/find/option.c b/usr.bin/find/option.c
--- a/usr.bin/find/option.c
+++ b/usr.bin/find/option.c
@@ -39,6 +39,10 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#ifdef __FreeBSD__
+#include <sys/acl.h>  /* for ACL_TYPE_NFS4 below */
+#endif
+
 #include <sys/types.h>
 #include <sys/stat.h>