diff --git a/Octokit/Models/Response/WorkflowJob.cs b/Octokit/Models/Response/WorkflowJob.cs
index d326483b..4c4ce0fd 100644
--- a/Octokit/Models/Response/WorkflowJob.cs
+++ b/Octokit/Models/Response/WorkflowJob.cs
@@ -10,7 +10,7 @@ namespace Octokit
     {
         public WorkflowJob() { }
 
-        public WorkflowJob(long id, long runId, string runUrl, string nodeId, string headSha, string url, string htmlUrl, WorkflowJobStatus status, WorkflowJobConclusion? conclusion, DateTimeOffset createdAt, DateTimeOffset startedAt, DateTimeOffset? completedAt, string name, IReadOnlyList<WorkflowJobStep> steps, string checkRunUrl, IReadOnlyList<string> labels, long? runnerId = default, string runnerName = default, long? runnerGroupId = default, string runnerGroupName = default)
+        public WorkflowJob(long id, long runId, string runUrl, string nodeId, string headSha, string url, string htmlUrl, WorkflowJobStatus status, WorkflowJobConclusion? conclusion, DateTimeOffset? createdAt, DateTimeOffset startedAt, DateTimeOffset? completedAt, string name, IReadOnlyList<WorkflowJobStep> steps, string checkRunUrl, IReadOnlyList<string> labels, long? runnerId = default, string runnerName = default, long? runnerGroupId = default, string runnerGroupName = default)
         {
             Id = id;
             RunId = runId;
@@ -82,7 +82,7 @@ namespace Octokit
         /// <summary>
         /// The time that the job was created.
         /// </summary>
-        public DateTimeOffset CreatedAt { get; private set; }
+        public DateTimeOffset? CreatedAt { get; private set; }
 
         /// <summary>
         /// The time that the job started.