diff --git a/src/Umbraco.Tests/Testing/UmbracoTestBase.cs b/src/Umbraco.Tests/Testing/UmbracoTestBase.cs
index 7e72a5aefb..b9fd0f6640 100644
--- a/src/Umbraco.Tests/Testing/UmbracoTestBase.cs
+++ b/src/Umbraco.Tests/Testing/UmbracoTestBase.cs
@@ -37,6 +37,7 @@ using Umbraco.Web.Routing;
 using Umbraco.Web.Trees;
 using Umbraco.Core.Composing.CompositionExtensions;
 using Umbraco.Core.Mapping;
+using Umbraco.Core.Serialization;
 using Umbraco.Web.Composing.CompositionExtensions;
 using Umbraco.Web.Sections;
 using Current = Umbraco.Core.Composing.Current;
@@ -327,6 +328,8 @@ namespace Umbraco.Tests.Testing
 
             Composition.RegisterUnique<IExamineManager>(factory => ExamineManager.Instance);
 
+            Composition.RegisterUnique<IJsonSerializer, JsonNetSerializer>();
+
             // register filesystems
             Composition.RegisterUnique(factory => TestObjects.GetFileSystemsMock());