diff --git a/mercurial/cext/parsers.c b/mercurial/cext/parsers.c
--- a/mercurial/cext/parsers.c
+++ b/mercurial/cext/parsers.c
@@ -710,7 +710,7 @@
 void manifest_module_init(PyObject *mod);
 void revlog_module_init(PyObject *mod);
 
-static const int version = 4;
+static const int version = 5;
 
 static void module_init(PyObject *mod)
 {
diff --git a/mercurial/cext/revlog.c b/mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c
+++ b/mercurial/cext/revlog.c
@@ -28,6 +28,20 @@
 #define PyInt_AsLong PyLong_AsLong
 #endif
 
+PyObject *get_index_entry_type(void) {
+	PyObject *mod, *obj;
+
+	mod = PyImport_ImportModule("mercurial.pure.parsers");
+	if (!mod) {
+		return NULL;
+	}
+
+	obj = PyObject_GetAttrString(mod, "IndexV1Entry");
+	Py_DECREF(mod);
+
+	return obj;
+}
+
 /*
  * A base-16 trie for fast node->rev mapping.
  *
@@ -54,6 +68,7 @@
 typedef struct {
 	PyObject_HEAD
 	/* Type-specific fields go here. */
+	PyObject *entrytype;   /* mercurial.pure.parsers.IndexV1Entry type */
 	PyObject *nullentry;   /* Represents an empty/unknown index value */
 	PyObject *data;        /* raw bytes of index */
 	Py_buffer buf;         /* buffer of data */
@@ -1862,6 +1877,7 @@
 	Py_ssize_t size;
 
 	/* Initialize before argument-checking to avoid index_dealloc() crash. */
+	self->entrytype = NULL;
 	self->nullentry = NULL;
 	self->raw_length = 0;
 	self->added = NULL;
@@ -1874,6 +1890,11 @@
 	self->nt = NULL;
 	self->offsets = NULL;
 
+	self->entrytype = get_index_entry_type();
+	if (!self->entrytype) {
+		return -1;
+	}
+
 	self->nullentry = Py_BuildValue("iiiiiiis#", 0, 0, 0,
 					-1, -1, -1, -1, nullid, 20);
 	if (!self->nullentry) {
@@ -1937,6 +1958,7 @@
 	}
 	Py_XDECREF(self->data);
 	Py_XDECREF(self->added);
+	Py_XDECREF(self->entrytype);
 	Py_XDECREF(self->nullentry);
 	PyObject_Del(self);
 }
@@ -2079,9 +2101,18 @@
 
 void revlog_module_init(PyObject *mod)
 {
+	PyObject *index_entry_type;
+
 	indexType.tp_new = PyType_GenericNew;
 	if (PyType_Ready(&indexType) < 0)
 		return;
 	Py_INCREF(&indexType);
 	PyModule_AddObject(mod, "index", (PyObject *)&indexType);
+
+	index_entry_type = get_index_entry_type();
+	if (!index_entry_type) {
+		return;
+	}
+
+	PyModule_AddObject(mod, "IndexV1Entry", index_entry_type);
 }
diff --git a/mercurial/policy.py b/mercurial/policy.py
--- a/mercurial/policy.py
+++ b/mercurial/policy.py
@@ -75,7 +75,7 @@
     (r'cext', r'diffhelpers'): 1,
     (r'cext', r'mpatch'): 1,
     (r'cext', r'osutil'): 3,
-    (r'cext', r'parsers'): 4,
+    (r'cext', r'parsers'): 5,
 }
 
 # map import request to other package or module