diff --git a/crypto/pkcs7/pk7_attr.c b/crypto/pkcs7/pk7_attr.c
index 5ad6670a4..7df59b735 100644
--- a/crypto/pkcs7/pk7_attr.c
+++ b/crypto/pkcs7/pk7_attr.c
@@ -170,7 +170,7 @@ int PKCS7_add1_attrib_digest(PKCS7_SIGNER_INFO *si,
 	if (!os)
 		return 0;
 	if (!ASN1_STRING_set(os, md, mdlen)
-		|| PKCS7_add_signed_attribute(si, NID_pkcs9_messageDigest,
+		|| !PKCS7_add_signed_attribute(si, NID_pkcs9_messageDigest,
 						V_ASN1_OCTET_STRING, os))
 		{
 		ASN1_OCTET_STRING_free(os);