diff --git a/openbsd-compat/reallocarray.c b/openbsd-compat/reallocarray.c
index 68f406446..cffe9b5ef 100644
--- a/openbsd-compat/reallocarray.c
+++ b/openbsd-compat/reallocarray.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: reallocarray.c,v 1.1 2014/05/08 21:43:49 deraadt Exp $	*/
+/*	$OpenBSD: reallocarray.c,v 1.2 2014/12/08 03:45:00 bcook Exp $	*/
 /*
  * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
  *
@@ -29,7 +29,7 @@
  * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
  * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
  */
-#define MUL_NO_OVERFLOW	(1UL << (sizeof(size_t) * 4))
+#define MUL_NO_OVERFLOW	((size_t)1 << (sizeof(size_t) * 4))
 
 void *
 reallocarray(void *optr, size_t nmemb, size_t size)