diff --git a/crypto/pem/pem_seal.c b/crypto/pem/pem_seal.c
index d400c169c73cf08cb874b407b57d43b0284e5b54..ae4598d67408947c889f2d8a3806f2825eb98798 100644
--- a/crypto/pem/pem_seal.c
+++ b/crypto/pem/pem_seal.c
@@ -101,7 +101,7 @@ int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
 
 	EVP_CIPHER_CTX_init(&ctx->cipher);
 	ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk);
-	if (!ret) goto err;
+	if (ret <= 0) goto err;
 
 	/* base64 encode the keys */
 	for (i=0; i<npubk; i++)