diff --git a/digest-libc.c b/digest-libc.c
index a216e78..40db002 100644
--- a/digest-libc.c
+++ b/digest-libc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: digest-libc.c,v 1.4 2014/12/21 22:27:56 djm Exp $ */
+/* $OpenBSD: digest-libc.c,v 1.5 2015/05/05 02:48:17 jsg Exp $ */
 /*
  * Copyright (c) 2013 Damien Miller <djm@mindrot.org>
  * Copyright (c) 2014 Markus Friedl.  All rights reserved.
@@ -172,7 +172,7 @@
 	const struct ssh_digest *digest = ssh_digest_by_alg(alg);
 	struct ssh_digest_ctx *ret;
 
-	if (digest == NULL || (ret = calloc(1, sizeof(ret))) == NULL)
+	if (digest == NULL || (ret = calloc(1, sizeof(*ret))) == NULL)
 		return NULL;
 	if ((ret->mdctx = calloc(1, digest->ctx_len)) == NULL) {
 		free(ret);