diff --git a/sys/rpc/rpcsec_tls/rpctls_impl.c b/sys/rpc/rpcsec_tls/rpctls_impl.c
--- a/sys/rpc/rpcsec_tls/rpctls_impl.c
+++ b/sys/rpc/rpcsec_tls/rpctls_impl.c
@@ -163,7 +163,7 @@
 	mtx_lock(&rpctls_lock);
 	upsp = RB_FIND(upsock_t, &upcall_sockets,
 	    &(struct upsock){
-	    .so = __DECONST(struct socket *, uap->socookie) });
+	    .so = (struct socket *)(uintptr_t)uap->socookie });
 	if (__predict_true(upsp != NULL)) {
 		RB_REMOVE(upsock_t, &upcall_sockets, upsp);
 		/*