diff --git a/vcsserver/git_lfs/app.py b/vcsserver/git_lfs/app.py
--- a/vcsserver/git_lfs/app.py
+++ b/vcsserver/git_lfs/app.py
@@ -24,7 +24,7 @@ from pyramid.httpexceptions import (
     HTTPBadRequest, HTTPNotImplemented, HTTPNotFound, HTTPForbidden,
     HTTPUnprocessableEntity)
 
-from vcsserver.lib.rc_json import json
+from vcsserver.lib.ext_json import json
 from vcsserver.git_lfs.lib import OidHandler, LFSOidStore
 from vcsserver.git_lfs.utils import safe_result, get_cython_compat_decorator
 from vcsserver.str_utils import safe_int
diff --git a/vcsserver/git_lfs/tests/test_lfs_app.py b/vcsserver/git_lfs/tests/test_lfs_app.py
--- a/vcsserver/git_lfs/tests/test_lfs_app.py
+++ b/vcsserver/git_lfs/tests/test_lfs_app.py
@@ -19,7 +19,7 @@ import os
 import pytest
 from webtest.app import TestApp as WebObTestApp
 
-from vcsserver.lib.rc_json import json
+from vcsserver.lib.ext_json import json
 from vcsserver.str_utils import safe_bytes
 from vcsserver.git_lfs.app import create_app
 from vcsserver.git_lfs.lib import LFSOidStore
diff --git a/vcsserver/hooks.py b/vcsserver/hooks.py
--- a/vcsserver/hooks.py
+++ b/vcsserver/hooks.py
@@ -31,7 +31,7 @@ from celery import Celery
 import mercurial.scmutil
 import mercurial.node
 
-from vcsserver.lib.rc_json import json
+from vcsserver.lib.ext_json import json
 from vcsserver import exceptions, subprocessio, settings
 from vcsserver.str_utils import ascii_str, safe_str
 from vcsserver.remote.git_remote import Repository
diff --git a/vcsserver/http_main.py b/vcsserver/http_main.py
--- a/vcsserver/http_main.py
+++ b/vcsserver/http_main.py
@@ -37,7 +37,7 @@ from pyramid.wsgi import wsgiapp
 from pyramid.response import Response
 
 from vcsserver.base import BytesEnvelope, BinaryEnvelope
-from vcsserver.lib.rc_json import json
+from vcsserver.lib.ext_json import json
 from vcsserver.config.settings_maker import SettingsMaker
 from vcsserver.str_utils import safe_int
 from vcsserver.lib.statsd_client import StatsdClient
diff --git a/vcsserver/lib/rc_json.py b/vcsserver/lib/ext_json.py
rename from vcsserver/lib/rc_json.py
rename to vcsserver/lib/ext_json.py
diff --git a/vcsserver/pygrack.py b/vcsserver/pygrack.py
--- a/vcsserver/pygrack.py
+++ b/vcsserver/pygrack.py
@@ -25,7 +25,7 @@ import dulwich.protocol
 from dulwich.protocol import CAPABILITY_SIDE_BAND, CAPABILITY_SIDE_BAND_64K
 from webob import Request, Response, exc
 
-from vcsserver.lib.rc_json import json
+from vcsserver.lib.ext_json import json
 from vcsserver import hooks, subprocessio
 from vcsserver.str_utils import ascii_bytes
 
diff --git a/vcsserver/tests/test_hooks.py b/vcsserver/tests/test_hooks.py
--- a/vcsserver/tests/test_hooks.py
+++ b/vcsserver/tests/test_hooks.py
@@ -26,7 +26,7 @@ import mock
 import pytest
 
 from vcsserver.hooks import HooksHttpClient
-from vcsserver.lib.rc_json import json
+from vcsserver.lib.ext_json import json
 from vcsserver import hooks