diff --git a/samples/MongoDb/UserRepository.cs b/samples/MongoDb/UserRepository.cs
index c253e40..b40dc7d 100644
--- a/samples/MongoDb/UserRepository.cs
+++ b/samples/MongoDb/UserRepository.cs
@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using MongoDB.Driver;
+using MongoDB.Driver.Linq;
 using Squadron.Samples.Shared;
 
 namespace Squadron.Samples.Mongo
diff --git a/samples/MongoDb/UserRepositoryTests.cs b/samples/MongoDb/UserRepositoryTests.cs
index 235394d..8a49356 100644
--- a/samples/MongoDb/UserRepositoryTests.cs
+++ b/samples/MongoDb/UserRepositoryTests.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using FluentAssertions;
 using MongoDB.Driver;
diff --git a/samples/MongoDb/UserRepositoryWithTransaction.cs b/samples/MongoDb/UserRepositoryWithTransaction.cs
index cd4be11..36536bf 100644
--- a/samples/MongoDb/UserRepositoryWithTransaction.cs
+++ b/samples/MongoDb/UserRepositoryWithTransaction.cs
@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using MongoDB.Driver;
+using MongoDB.Driver.Linq;
 using Squadron.Samples.Shared;
 
 namespace Squadron.Samples.Mongo