diff --git a/src/modules/Elsa.Workflows.Api/Contracts/IWorkflowInstanceExportNameProvider.cs b/src/modules/Elsa.Workflows.Api/Contracts/IWorkflowInstanceExportNameProvider.cs
index 12d510470..c97ed57fc 100644
--- a/src/modules/Elsa.Workflows.Api/Contracts/IWorkflowInstanceExportNameProvider.cs
+++ b/src/modules/Elsa.Workflows.Api/Contracts/IWorkflowInstanceExportNameProvider.cs
@@ -14,5 +14,5 @@ public interface IWorkflowInstanceExportNameProvider
     /// <param name="model">The export model representing the instance (optional).</param>
     /// <param name="cancellationToken">Cancellation token.</param>
     /// <returns>A filename safe for saving to disk.</returns>
-    Task<string> GetFileNameAsync(WorkflowInstance instance, object model, CancellationToken cancellationToken = default);
+    Task<string> GetFileNameAsync(WorkflowInstance instance, object? model, CancellationToken cancellationToken = default);
 }
diff --git a/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowInstances/Export/Endpoint.cs b/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowInstances/Export/Endpoint.cs
index 2b695ff11..3806e7d11 100644
--- a/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowInstances/Export/Endpoint.cs
+++ b/src/modules/Elsa.Workflows.Api/Endpoints/WorkflowInstances/Export/Endpoint.cs
@@ -31,7 +31,7 @@ internal class Export : ElsaEndpointWithMapper<Request, WorkflowInstanceMapper>
     private readonly IWorkflowStateSerializer _workflowStateSerializer;
     private readonly IPayloadSerializer _payloadSerializer;
     private readonly ISafeSerializer _safeSerializer;
-    private readonly IWorkflowInstanceExportNameProvider _workFlowInstanceExportNameProvider;
+    private readonly IWorkflowInstanceExportNameProvider _workflowInstanceExportNameProvider;
 
     /// <inheritdoc />
     public Export(
@@ -51,7 +51,7 @@ internal class Export : ElsaEndpointWithMapper<Request, WorkflowInstanceMapper>
         _workflowStateSerializer = workflowStateSerializer;
         _payloadSerializer = payloadSerializer;
         _safeSerializer = safeSerializer;
-        _workFlowInstanceExportNameProvider = workFlowInstanceExportNameProvider;
+        _workflowInstanceExportNameProvider = workFlowInstanceExportNameProvider;
     }
 
     /// <inheritdoc />
@@ -89,7 +89,7 @@ internal class Export : ElsaEndpointWithMapper<Request, WorkflowInstanceMapper>
                 var model = await CreateExportModelAsync(request, instance, cancellationToken);
                 var binaryJson = SerializeWorkflowInstance(model);
 
-                var fileName = await _workFlowInstanceExportNameProvider.GetFileNameAsync(instance, model, cancellationToken);
+                var fileName = await _workflowInstanceExportNameProvider.GetFileNameAsync(instance, model, cancellationToken);
 
                 var entry = zipArchive.CreateEntry(fileName, CompressionLevel.Optimal);
                 await using var entryStream = entry.Open();
@@ -114,7 +114,7 @@ internal class Export : ElsaEndpointWithMapper<Request, WorkflowInstanceMapper>
 
         var model = await CreateExportModelAsync(request, instance, cancellationToken);
         var binaryJson = SerializeWorkflowInstance(model);
-        var fileName = await _workFlowInstanceExportNameProvider.GetFileNameAsync(instance, model, cancellationToken);
+        var fileName = await _workflowInstanceExportNameProvider.GetFileNameAsync(instance, model, cancellationToken);
 
         await Send.BytesAsync(binaryJson, fileName, cancellation: cancellationToken);
     }
diff --git a/src/modules/Elsa.Workflows.Api/Providers/DefaultWorkflowInstanceExportNameProvider.cs b/src/modules/Elsa.Workflows.Api/Providers/DefaultWorkflowInstanceExportNameProvider.cs
index 76728e26e..35bd349f8 100644
--- a/src/modules/Elsa.Workflows.Api/Providers/DefaultWorkflowInstanceExportNameProvider.cs
+++ b/src/modules/Elsa.Workflows.Api/Providers/DefaultWorkflowInstanceExportNameProvider.cs
@@ -7,7 +7,7 @@ namespace Elsa.Workflows.Api;
 /// </summary>
 public class DefaultWorkflowInstanceExportNameProvider : IWorkflowInstanceExportNameProvider
 {
-    public Task<string> GetFileNameAsync(WorkflowInstance instance, object model, CancellationToken cancellationToken = default)
+    public Task<string> GetFileNameAsync(WorkflowInstance instance, object? model, CancellationToken cancellationToken = default)
     {
         var fileName = $"workflow-instance-{instance.Id.ToLowerInvariant()}.json";
         return Task.FromResult(fileName);