diff --git a/generate_random_jwks.py b/generate_random_jwks.py
index 670b9f4..3f27be0 100644
--- a/generate_random_jwks.py
+++ b/generate_random_jwks.py
@@ -4,12 +4,12 @@
 
 def generate_signing_key():
     key = jwk.JWK.generate(kty='EC', crv='P-256', alg='ES256', use='sig')
-    key._params['kid'] = key.thumbprint()
+    key.setdefault("kid",key.thumbprint())
     return key
 
 def generate_encryption_key():
     key = jwk.JWK.generate(kty='EC', crv='P-256', alg='ECDH-ES', use='enc')
-    key._params['kid'] = key.thumbprint()
+    key.setdefault("kid",key.thumbprint())
     return key
 
 def generate_keyset(keys):