diff --git a/src/Umbraco.Tests/PluginManagerTests.cs b/src/Umbraco.Tests/PluginManagerTests.cs
index 8d0de407ec..0780d90570 100644
--- a/src/Umbraco.Tests/PluginManagerTests.cs
+++ b/src/Umbraco.Tests/PluginManagerTests.cs
@@ -271,7 +271,7 @@ namespace Umbraco.Tests
         public void Resolves_Assigned_Mappers()
         {
             var foundTypes1 = PluginManager.Current.ResolveAssignedMapperTypes();
-            Assert.AreEqual(20, foundTypes1.Count());
+            Assert.AreEqual(21, foundTypes1.Count());
         }
 
         [Test]