diff --git a/lib/crypto_backend/crypto_nettle.c b/lib/crypto_backend/crypto_nettle.c
index e31cedc6..36a9d05e 100644
--- a/lib/crypto_backend/crypto_nettle.c
+++ b/lib/crypto_backend/crypto_nettle.c
@@ -284,8 +284,7 @@ int crypt_hmac_init(struct crypt_hmac **ctx, const char *name,
 	h = malloc(sizeof(*h));
 	if (!h)
 		return -ENOMEM;
-	memset(ctx, 0, sizeof(*ctx));
-
+	memset(h, 0, sizeof(*h));
 
 	h->hash = _get_alg(name);
 	if (!h->hash) {
diff --git a/lib/crypto_backend/crypto_nss.c b/lib/crypto_backend/crypto_nss.c
index f07a1dda..0c05da11 100644
--- a/lib/crypto_backend/crypto_nss.c
+++ b/lib/crypto_backend/crypto_nss.c
@@ -207,8 +207,7 @@ int crypt_hmac_init(struct crypt_hmac **ctx, const char *name,
 	h = malloc(sizeof(*h));
 	if (!h)
 		return -ENOMEM;
-	memset(ctx, 0, sizeof(*ctx));
-
+	memset(h, 0, sizeof(*h));
 
 	h->hash = _get_alg(name);
 	if (!h->hash)