diff --git a/src/Umbraco.Core/Composing/TypeFinder.cs b/src/Umbraco.Core/Composing/TypeFinder.cs
index 5378283cc9..ec66f3f310 100644
--- a/src/Umbraco.Core/Composing/TypeFinder.cs
+++ b/src/Umbraco.Core/Composing/TypeFinder.cs
@@ -148,6 +148,8 @@ namespace Umbraco.Core.Composing
             "System.Data.Entity,",
             "System.Runtime,",
             "System.Runtime.",
+            "System.Numerics.",
+            "System.Buffers,",
             "TidyNet,",
             "TidyNet.",
             "WebDriver,",