diff --git a/doc/conf.py b/doc/conf.py
index ae34d0a4e..584165362 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -16,6 +16,12 @@ import sys
 import os
 import shlex
 
+# These 4 lines added to enable ReadTheDocs to work.
+import mock
+MOCK_MODULES = ["libraylib", "IPython", "numpy", "typing", "funcsigs", "subprocess32", "protobuf", "colorama", "graphviz", "ray.internal.graph_pb2"]
+for mod_name in MOCK_MODULES:
+  sys.modules[mod_name] = mock.Mock()
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
diff --git a/lib/python/ray/__init__.py b/lib/python/ray/__init__.py
index 2284976fe..903307e7f 100644
--- a/lib/python/ray/__init__.py
+++ b/lib/python/ray/__init__.py
@@ -6,6 +6,7 @@ WORKER_MODE = 1
 SHELL_MODE = 2
 PYTHON_MODE = 3
 
+import config
 import libraylib as lib
 import serialization
 from worker import scheduler_info, visualize_computation_graph, task_info, register_module, connect, disconnect, get, put, remote, kill_workers, restart_workers_local
diff --git a/lib/python/ray/services.py b/lib/python/ray/services.py
index cde00103a..d80a84062 100644
--- a/lib/python/ray/services.py
+++ b/lib/python/ray/services.py
@@ -5,7 +5,6 @@ import subprocess32 as subprocess
 
 import ray
 import worker
-import ray.config as config
 
 _services_env = os.environ.copy()
 _services_env["PATH"] = os.pathsep.join([os.path.dirname(os.path.abspath(__file__)), _services_env["PATH"]])
@@ -92,7 +91,7 @@ def start_scheduler(scheduler_address, local):
       process will be killed by serices.cleanup() when the Python process that
       imported services exits.
   """
-  p = subprocess.Popen(["scheduler", scheduler_address, "--log-file-name", config.get_log_file_path("scheduler.log")], env=_services_env)
+  p = subprocess.Popen(["scheduler", scheduler_address, "--log-file-name", ray.config.get_log_file_path("scheduler.log")], env=_services_env)
   if local:
     all_processes.append((p, scheduler_address))
 
@@ -107,7 +106,7 @@ def start_objstore(scheduler_address, objstore_address, local):
       process will be killed by serices.cleanup() when the Python process that
       imported services exits.
   """
-  p = subprocess.Popen(["objstore", scheduler_address, objstore_address, "--log-file-name", config.get_log_file_path("-".join(["objstore", objstore_address]) + ".log")], env=_services_env)
+  p = subprocess.Popen(["objstore", scheduler_address, objstore_address, "--log-file-name", ray.config.get_log_file_path("-".join(["objstore", objstore_address]) + ".log")], env=_services_env)
   if local:
     all_processes.append((p, objstore_address))
 
diff --git a/lib/python/ray/worker.py b/lib/python/ray/worker.py
index 184163b2e..c9bc515c9 100644
--- a/lib/python/ray/worker.py
+++ b/lib/python/ray/worker.py
@@ -10,7 +10,6 @@ import numpy as np
 import colorama
 
 import ray
-import ray.config as config
 import serialization
 import ray.internal.graph_pb2
 import ray.graph
@@ -313,7 +312,7 @@ def visualize_computation_graph(file_path=None, view=False, worker=global_worker
   """
 
   if file_path is None:
-    file_path = config.get_log_file_path("computation-graph.pdf")
+    file_path = ray.config.get_log_file_path("computation-graph.pdf")
 
   base_path, extension = os.path.splitext(file_path)
   if extension != ".pdf":
@@ -369,8 +368,8 @@ def connect(scheduler_address, objstore_address, worker_address, is_driver=False
   worker.handle = ray.lib.create_worker(worker.scheduler_address, worker.objstore_address, worker.worker_address, is_driver)
   worker.set_mode(mode)
   FORMAT = "%(asctime)-15s %(message)s"
-  logging.basicConfig(level=logging.DEBUG, format=FORMAT, filename=config.get_log_file_path("-".join(["worker", worker_address]) + ".log"))
-  ray.lib.set_log_config(config.get_log_file_path("-".join(["worker", worker_address, "c++"]) + ".log"))
+  logging.basicConfig(level=logging.DEBUG, format=FORMAT, filename=ray.config.get_log_file_path("-".join(["worker", worker_address]) + ".log"))
+  ray.lib.set_log_config(ray.config.get_log_file_path("-".join(["worker", worker_address, "c++"]) + ".log"))
 
 def disconnect(worker=global_worker):
   """Disconnect this worker from the scheduler and object store."""