diff --git a/python/google/protobuf/descriptor_pool.py b/python/google/protobuf/descriptor_pool.py
index dccac5e714..1ebf11834a 100644
--- a/python/google/protobuf/descriptor_pool.py
+++ b/python/google/protobuf/descriptor_pool.py
@@ -120,11 +120,13 @@ class DescriptorPool(object):
 
   if _USE_C_DESCRIPTORS:
 
-    def __new__(cls, descriptor_db=None):
-      # pylint: disable=protected-access
-      return descriptor._message.DescriptorPool(descriptor_db)
+   def __new__(cls, descriptor_db=None):
+     # pylint: disable=protected-access
+     return descriptor._message.DescriptorPool(descriptor_db)
 
-  def __init__(self, descriptor_db=None):
+  def __init__(
+      self, descriptor_db=None, use_deprecated_legacy_json_field_conflicts=False
+  ):
     """Initializes a Pool of proto buffs.
 
     The descriptor_db argument to the constructor is provided to allow
@@ -135,6 +137,8 @@ class DescriptorPool(object):
 
     Args:
       descriptor_db: A secondary source of file descriptors.
+      use_deprecated_legacy_json_field_conflicts: Unused, for compatibility with
+        C++.
     """
 
     self._internal_db = descriptor_database.DescriptorDatabase()
diff --git a/python/google/protobuf/pyext/descriptor_pool.cc b/python/google/protobuf/pyext/descriptor_pool.cc
index 9388f16c96..6899e94b44 100644
--- a/python/google/protobuf/pyext/descriptor_pool.cc
+++ b/python/google/protobuf/pyext/descriptor_pool.cc
@@ -155,20 +155,26 @@ static PyDescriptorPool* PyDescriptorPool_NewWithUnderlay(
 }
 
 static PyDescriptorPool* PyDescriptorPool_NewWithDatabase(
-    DescriptorDatabase* database) {
+    DescriptorDatabase* database,
+    bool use_deprecated_legacy_json_field_conflicts) {
   PyDescriptorPool* cpool = _CreateDescriptorPool();
   if (cpool == nullptr) {
     return nullptr;
   }
+  DescriptorPool* pool;
   if (database != nullptr) {
     cpool->error_collector = new BuildFileErrorCollector();
-    cpool->pool = new DescriptorPool(database, cpool->error_collector);
+    pool = new DescriptorPool(database, cpool->error_collector);
     cpool->is_mutable = false;
     cpool->database = database;
   } else {
-    cpool->pool = new DescriptorPool();
+    pool = new DescriptorPool();
     cpool->is_mutable = true;
   }
+  if (use_deprecated_legacy_json_field_conflicts) {
+    pool->UseDeprecatedLegacyJsonFieldConflicts();
+  }
+  cpool->pool = pool;
   cpool->is_owned = true;
 
   if (!descriptor_pool_map->insert(std::make_pair(cpool->pool, cpool)).second) {
@@ -183,6 +189,7 @@ static PyDescriptorPool* PyDescriptorPool_NewWithDatabase(
 // The public DescriptorPool constructor.
 static PyObject* New(PyTypeObject* type,
                      PyObject* args, PyObject* kwargs) {
+  int use_deprecated_legacy_json_field_conflicts = 0;
   static const char* kwlist[] = {"descriptor_db", nullptr};
   PyObject* py_database = nullptr;
   if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O",
@@ -193,8 +200,8 @@ static PyObject* New(PyTypeObject* type,
   if (py_database && py_database != Py_None) {
     database = new PyDescriptorDatabase(py_database);
   }
-  return reinterpret_cast<PyObject*>(
-      PyDescriptorPool_NewWithDatabase(database));
+  return reinterpret_cast<PyObject*>(PyDescriptorPool_NewWithDatabase(
+      database, use_deprecated_legacy_json_field_conflicts));
 }
 
 static void Dealloc(PyObject* pself) {