diff --git a/packages/aws-cdk/lib/api/aws-auth/credential-plugins.ts b/packages/aws-cdk/lib/api/aws-auth/credential-plugins.ts
index b2047bd3fbbfb..8737f1eed2096 100644
--- a/packages/aws-cdk/lib/api/aws-auth/credential-plugins.ts
+++ b/packages/aws-cdk/lib/api/aws-auth/credential-plugins.ts
@@ -140,7 +140,7 @@ function v3ProviderFromV2Credentials(x: SDKv2CompatibleCredentials): AwsCredenti
       accessKeyId: x.accessKeyId,
       secretAccessKey: x.secretAccessKey,
       sessionToken: x.sessionToken,
-      expiration: x.expireTime,
+      expiration: x.expireTime ?? undefined,
     };
   };
 }