diff --git a/src/WorkFlow.Application/Mapping/UriBuilderResolver.cs b/src/WorkFlow.Application/Mapping/UriBuilderResolver.cs
index 9e82724..ddf388f 100644
--- a/src/WorkFlow.Application/Mapping/UriBuilderResolver.cs
+++ b/src/WorkFlow.Application/Mapping/UriBuilderResolver.cs
@@ -5,13 +5,13 @@ using WorkFlow.Domain.Entities;
 
 namespace WorkFlow.Application.Mapping;
 
-public class UriBuilderResolver : IValueResolver<TfFile, TfFileDto, UriBuilder>
+public class UriBuilderResolver : IValueResolver<TfFile, TfFileDto, UriBuilder?>
 {
     private readonly UriBuilder _uriBuilder;
 
     public UriBuilderResolver(UriBuilder uriBuilder) => _uriBuilder = uriBuilder;
 
-    public UriBuilder Resolve(TfFile source, TfFileDto destination, UriBuilder destMember, ResolutionContext context)
+    public UriBuilder? Resolve(TfFile source, TfFileDto destination, UriBuilder? destMember, ResolutionContext context)
     {
         var builder = new UriBuilder(_uriBuilder.Uri)
         {