diff --git a/sys/rpc/clnt_vc.c.tsleep b/sys/rpc/clnt_vc.c
--- a/sys/rpc/clnt_vc.c.tsleep
+++ b/sys/rpc/clnt_vc.c
@@ -453,7 +453,9 @@
 		mtx_lock(&ct->ct_lock);
 		TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
 		/* Sleep for 1 clock tick before trying the sosend() again. */
-		msleep(&fake_wchan, &ct->ct_lock, 0, "rpclpsnd", 1);
+		mtx_unlock(&ct->ct_lock);
+		tsleep(&fake_wchan, 0, "rpclpsnd", 1);
+		mtx_lock(&ct->ct_lock);
 		goto call_again;
 	}