diff --git a/Assets/Mirror/Tests/Mirror.Tests.asmdef b/Assets/Mirror/Tests/Mirror.Tests.asmdef
index 1463222b6..f70205b10 100644
--- a/Assets/Mirror/Tests/Mirror.Tests.asmdef
+++ b/Assets/Mirror/Tests/Mirror.Tests.asmdef
@@ -12,8 +12,12 @@
     ],
     "excludePlatforms": [],
     "allowUnsafeCode": false,
-    "overrideReferences": false,
-    "precompiledReferences": [],
+    "overrideReferences": true,
+    "precompiledReferences": [
+        "NSubstitute.dll",
+        "Castle.Core.dll",
+        "System.Threading.Tasks.Extensions.dll"
+    ],
     "autoReferenced": true,
     "defineConstraints": []
 }
\ No newline at end of file