diff --git a/crypto/pkcs7/pk7_smime.c b/crypto/pkcs7/pk7_smime.c
index 64a3cc476362356e0c10ced32a4389ae4c969c66..39b18a4a46fcf6099dc1820f01746f3be7ef09e0 100644
--- a/crypto/pkcs7/pk7_smime.c
+++ b/crypto/pkcs7/pk7_smime.c
@@ -216,7 +216,8 @@ PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
 			{
 			if (!pkcs7_copy_existing_digest(p7, si))
 				goto err;
-			if (!PKCS7_SIGNER_INFO_sign(si))
+			if (!(flags & PKCS7_PARTIAL) &&
+					!PKCS7_SIGNER_INFO_sign(si))
 				goto err;
 			}
 		}