diff --git a/lib/jwk/key/base.js b/lib/jwk/key/base.js
index e6e6087483..ea4ea7c01c 100644
--- a/lib/jwk/key/base.js
+++ b/lib/jwk/key/base.js
@@ -56,7 +56,7 @@ class Key {
         let publicKey
         try {
           publicKey = createPublicKey({
-            key: `-----BEGIN CERTIFICATE-----\n${cert}\n-----END CERTIFICATE-----`, format: 'pem'
+            key: `-----BEGIN CERTIFICATE-----\n${cert.match(/.{1,64}/g).join('\n')}\n-----END CERTIFICATE-----`, format: 'pem'
           })
         } catch (err) {
           throw new errors.JWKInvalid(`\`x5c\` member at index ${i} is not a valid base64-encoded DER PKIX certificate`)