diff --git a/src/lib/libc/stdlib/seed48.c b/src/lib/libc/stdlib/seed48.c
index 0485ed6a..b4b4424c 100644
--- a/src/lib/libc/stdlib/seed48.c
+++ b/src/lib/libc/stdlib/seed48.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: seed48.c,v 1.5 2015/08/27 04:33:31 guenther Exp $ */
+/*	$OpenBSD: seed48.c,v 1.6 2015/09/13 15:20:40 guenther Exp $ */
 /*
  * Copyright (c) 1993 Martin Birgmeier
  * All rights reserved.
@@ -42,3 +42,4 @@ seed48_deterministic(unsigned short xseed[3])
 	__rand48_add = RAND48_ADD;
 	return sseed;
 }
+DEF_WEAK(seed48_deterministic);