diff --git a/src/Microsoft.Extensions.Testing.Abstractions/project.json b/src/Microsoft.Extensions.Testing.Abstractions/project.json
index 4135cd377..da1777c72 100644
--- a/src/Microsoft.Extensions.Testing.Abstractions/project.json
+++ b/src/Microsoft.Extensions.Testing.Abstractions/project.json
@@ -21,7 +21,8 @@
       "dependencies": {
         "NETStandard.Library": "1.5.0-rc2-23911",
         "System.Resources.ResourceManager": "4.0.1-rc2-23911",
-        "System.Runtime.Serialization.Primitives": "4.1.0-rc2-23911"
+        "System.Runtime.Serialization.Primitives": "4.1.0-rc2-23911",
+        "System.Reflection.TypeExtensions": "4.1.0-rc2-23911"
       }
     }
   },