diff --git a/Assets/Plugins/MessagePack/MessagePack.asmdef b/Assets/Plugins/MessagePack/MessagePack.SourceDisabled.asmdef
similarity index 72%
rename from Assets/Plugins/MessagePack/MessagePack.asmdef
rename to Assets/Plugins/MessagePack/MessagePack.SourceDisabled.asmdef
index 21d605138..d1803438e 100644
--- a/Assets/Plugins/MessagePack/MessagePack.asmdef
+++ b/Assets/Plugins/MessagePack/MessagePack.SourceDisabled.asmdef
@@ -1,5 +1,5 @@
 {
-    "name": "MessagePack",
+    "name": "MessagePack.SourceDisabled",
     "references": [
         "GUID:215598cda61754a45bc1f34e1d38d3af"
     ],
@@ -9,7 +9,9 @@
     "overrideReferences": false,
     "precompiledReferences": [],
     "autoReferenced": false,
-    "defineConstraints": [],
+    "defineConstraints": [
+        "AETHERIA_USE_SOURCE_MESSAGEPACK"
+    ],
     "versionDefines": [],
     "noEngineReferences": false
 }
diff --git a/Assets/Plugins/MessagePack/MessagePack.asmdef.meta b/Assets/Plugins/MessagePack/MessagePack.SourceDisabled.asmdef.meta
similarity index 100%
rename from Assets/Plugins/MessagePack/MessagePack.asmdef.meta
rename to Assets/Plugins/MessagePack/MessagePack.SourceDisabled.asmdef.meta
diff --git a/Assets/Plugins/System.Runtime.CompilerServices.Unsafe.dll.meta b/Assets/Plugins/System.Runtime.CompilerServices.Unsafe.dll.meta
index ff4acd7c5..3b675e1fd 100644
--- a/Assets/Plugins/System.Runtime.CompilerServices.Unsafe.dll.meta
+++ b/Assets/Plugins/System.Runtime.CompilerServices.Unsafe.dll.meta
@@ -8,13 +8,13 @@ PluginImporter:
   defineConstraints: []
   isPreloaded: 0
   isOverridable: 0
-  isExplicitlyReferenced: 0
+  isExplicitlyReferenced: 1
   validateReferences: 1
   platformData:
   - first:
       Any: 
     second:
-      enabled: 1
+      enabled: 0
       settings: {}
   - first:
       Editor: Editor