diff --git a/handler/generate_certificate.go b/handler/generate_certificate.go
index 823aa78c4bae3f3b5216aa71097659d5b124e121..d5ec9a982b5b10773f4de698644909dcd32f81ed 100644
--- a/handler/generate_certificate.go
+++ b/handler/generate_certificate.go
@@ -104,7 +104,7 @@ func generateCertificate(publicKeyBytes []byte, caCertFilePath string, caPrivate
 		NotBefore:             	notBeforeTime,
 		NotAfter:              	notAfterTime,
 		KeyUsage:              	x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment | x509.KeyUsageDataEncipherment | x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
-		ExtKeyUsage:           	[]x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth | x509.ExtKeyUsageEmailProtection | x509.ExtKeyUsageTimeStamping},
+		ExtKeyUsage:           	[]x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageEmailProtection, x509.ExtKeyUsageTimeStamping},
 		BasicConstraintsValid: 	true,
 		IsCA:     				true,
 	}