diff --git a/src/index.c b/src/index.c
index 79554fc..81b20cb 100644
--- a/src/index.c
+++ b/src/index.c
@@ -542,7 +542,7 @@ PyTypeObject IndexIterType = {
     0,                                         /* tp_hash           */
     0,                                         /* tp_call           */
     0,                                         /* tp_str            */
-    PyObject_GenericGetAttr,                   /* tp_getattro       */
+    0,                                         /* tp_getattro       */
     0,                                         /* tp_setattro       */
     0,                                         /* tp_as_buffer      */
     Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,  /* tp_flags          */
diff --git a/src/reference.c b/src/reference.c
index b508567..6d9a773 100644
--- a/src/reference.c
+++ b/src/reference.c
@@ -446,7 +446,7 @@ PyTypeObject RefLogEntryType = {
     0,                                         /* tp_iternext       */
     0,                                         /* tp_methods        */
     RefLogEntry_members,                       /* tp_members        */
-    0,                                         /* tp_getset         */
+    RefLogEntry_getseters,                     /* tp_getset         */
     0,                                         /* tp_base           */
     0,                                         /* tp_dict           */
     0,                                         /* tp_descr_get      */
diff --git a/src/tree.c b/src/tree.c
index 6121c3f..c092e5e 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -462,7 +462,7 @@ PyTypeObject TreeIterType = {
     0,                                         /* tp_hash           */
     0,                                         /* tp_call           */
     0,                                         /* tp_str            */
-    PyObject_GenericGetAttr,                   /* tp_getattro       */
+    0,                                         /* tp_getattro       */
     0,                                         /* tp_setattro       */
     0,                                         /* tp_as_buffer      */
     Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,  /* tp_flags          */