diff --git a/Assets/VRM.Samples/VRM.Samples.asmdef b/Assets/VRM.Samples/VRM.Samples.asmdef
index b10b7f194..3b5bad019 100644
--- a/Assets/VRM.Samples/VRM.Samples.asmdef
+++ b/Assets/VRM.Samples/VRM.Samples.asmdef
@@ -2,6 +2,7 @@
     "name": "VRM.Samples",
     "references": [
         "VRM",
+        "DepthFirstScheduler",
         "UniHumanoid"
     ],
     "optionalUnityReferences": [],