diff --git a/sys/kern/vfs_default.c.xattr b/sys/kern/vfs_default.c
--- a/sys/kern/vfs_default.c.xattr
+++ b/sys/kern/vfs_default.c
@@ -452,6 +452,7 @@
 		case _PC_INF_PRESENT:
 		case _PC_MAC_PRESENT:
 		case _PC_NAMEDATTR_ENABLED:
+		case _PC_HAS_NAMEDATTR:
 			*ap->a_retval = 0;
 			return (0);
 		default:
diff --git a/sys/sys/unistd.h.xattr b/sys/sys/unistd.h
--- a/sys/sys/unistd.h.xattr
+++ b/sys/sys/unistd.h
@@ -155,6 +155,7 @@
 #define	_PC_ACL_NFS4		64
 #define	_PC_DEALLOC_PRESENT	65
 #define	_PC_NAMEDATTR_ENABLED	66
+#define	_PC_HAS_NAMEDATTR	67
 #endif
 
 /* From OpenSolaris, used by SEEK_DATA/SEEK_HOLE. */