diff --git a/crypto/hmac/hm_ameth.c b/crypto/hmac/hm_ameth.c
index a6aa79311..3d998e94d 100644
--- a/crypto/hmac/hm_ameth.c
+++ b/crypto/hmac/hm_ameth.c
@@ -123,6 +123,8 @@ static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
 		if (!*pder)
 			{
 			*pder = OPENSSL_malloc(os->length);
+			if (*pder == NULL)
+				return -1;
 			inc = 0;
 			}
 		else inc = 1;