diff --git a/swh/lister/phabricator/lister.py b/swh/lister/phabricator/lister.py
--- a/swh/lister/phabricator/lister.py
+++ b/swh/lister/phabricator/lister.py
@@ -80,9 +80,8 @@
 
     def get_next_target_from_response(self, response):
         body = response.json()['result']['cursor']
-        if body['after'] != 'null':
-            return body['after']
-        return None
+        if body['after'] and body['after'] != 'null':
+            return int(body['after'])
 
     def transport_response_simplified(self, response):
         repos = response.json()
diff --git a/swh/lister/phabricator/tests/test_lister.py b/swh/lister/phabricator/tests/test_lister.py
--- a/swh/lister/phabricator/tests/test_lister.py
+++ b/swh/lister/phabricator/tests/test_lister.py
@@ -84,3 +84,14 @@
         ingested_repos = list(fl.db_query_range(self.first_index,
                                                 self.last_index))
         self.assertEqual(len(ingested_repos), self.entries_per_page)
+
+    @requests_mock.Mocker()
+    def test_range_listing(self, http_mocker):
+        fl = self.create_fl_with_db(http_mocker)
+
+        fl.run(max_bound=self.last_index - 1)
+
+        self.assertEqual(fl.db_last_index(), self.last_index - 1)
+        ingested_repos = list(fl.db_query_range(self.first_index,
+                                                self.last_index))
+        self.assertEqual(len(ingested_repos), self.entries_per_page - 1)