diff --git a/pki/cert/cert.go b/pki/cert/cert.go
index 7af1a5f3..fbb8895a 100644
--- a/pki/cert/cert.go
+++ b/pki/cert/cert.go
@@ -149,7 +149,7 @@ func GenerateSelfSignedCertKey(host string, alternateIPs []net.IP, alternateDNS
 			CommonName: fmt.Sprintf("%s-ca@%d", host, time.Now().Unix()),
 		},
 		NotBefore: time.Now(),
-		NotAfter:  time.Now().Add(time.Hour * 24 * 365),
+		NotAfter:  time.Now().Add(duration365d),
 
 		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
 		BasicConstraintsValid: true,
@@ -177,7 +177,7 @@ func GenerateSelfSignedCertKey(host string, alternateIPs []net.IP, alternateDNS
 			CommonName: fmt.Sprintf("%s@%d", host, time.Now().Unix()),
 		},
 		NotBefore: time.Now(),
-		NotAfter:  time.Now().Add(time.Hour * 24 * 365),
+		NotAfter:  time.Now().Add(duration365d),
 
 		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
 		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},