diff --git a/doc/source/conf.py b/doc/source/conf.py
index af739c88d..dca1d11ef 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -42,6 +42,7 @@ MOCK_MODULES = [
     "kubernetes",
     "mxnet.model",
     "psutil",
+    "ray._raylet",
     "ray.core.generated",
     "ray.core.generated.common_pb2",
     "ray.core.generated.gcs_pb2",