diff --git a/crypto/ec/ec_pmeth.c b/crypto/ec/ec_pmeth.c
index 81ad4d499a1276651d4d66e8e4cced8d84d98b3f..e66e6908274c9a6680096f160852848b22661dda 100644
--- a/crypto/ec/ec_pmeth.c
+++ b/crypto/ec/ec_pmeth.c
@@ -244,8 +244,8 @@ static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
 	outlen = *keylen;
 		
 	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
-	if (ret < 0)
-		return ret;
+	if (ret <= 0)
+		return 0;
 	*keylen = ret;
 	return 1;
 	}