diff --git a/pkcs7/pkcs7_test.go b/pkcs7/pkcs7_test.go
index 0592635..ec707d6 100644
--- a/pkcs7/pkcs7_test.go
+++ b/pkcs7/pkcs7_test.go
@@ -125,7 +125,7 @@ func createTestCertificateByIssuer(name string, issuer *certKeyPair, sigAlg x509
 	}
 	if issuer != nil {
 		issuerCert = issuer.Certificate
-		issuerKey = issuer.PrivateKey
+		issuerKey = *issuer.PrivateKey
 	}
 
 	switch sigAlg {