diff --git a/tests/Squidex.Domain.Apps.Write.Tests/TestHelpers/AssertHelper.cs b/tests/Squidex.Domain.Apps.Write.Tests/TestHelpers/AssertHelper.cs
index 3041728af..3a2e3c19d 100644
--- a/tests/Squidex.Domain.Apps.Write.Tests/TestHelpers/AssertHelper.cs
+++ b/tests/Squidex.Domain.Apps.Write.Tests/TestHelpers/AssertHelper.cs
@@ -23,6 +23,7 @@ namespace Squidex.Domain.Apps.Write.TestHelpers
 
             for (var i = 0; i < source.Length; i++)
             {
+                source[i].Should().BeOfType(others[i].GetType());
                 ((object)source[i]).ShouldBeEquivalentTo(others[i], o => o.IncludingAllDeclaredProperties());
             }
         }