diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 15677e7..753a9e3 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -365,6 +365,9 @@
 	struct rpc_clnt *r = clp->cl_rpcclient;
 	char *p = svc_gss_principal(rqstp);
 
+	/* No RPC_AUTH_GSS on NFSv4.1 back channel yet */
+	if (clp->cl_minorversion != 0)
+		return SVC_DROP;
 	/*
 	 * It might just be a normal user principal, in which case
 	 * userspace won't bother to tell us the name at all.