diff --git a/swh/lister/tests/test_utils.py b/swh/lister/tests/test_utils.py
--- a/swh/lister/tests/test_utils.py
+++ b/swh/lister/tests/test_utils.py
@@ -11,7 +11,12 @@
 
 @pytest.mark.parametrize(
     "total_pages,nb_pages,expected_ranges",
-    [(14, 5, [(0, 5), (5, 10), (10, 14)]), (19, 10, [(0, 10), (10, 19)])],
+    [
+        (14, 5, [(0, 4), (5, 9), (10, 14)]),
+        (19, 10, [(0, 9), (10, 19)]),
+        (20, 3, [(0, 2), (3, 5), (6, 8), (9, 11), (12, 14), (15, 17), (18, 20)]),
+        (21, 3, [(0, 2), (3, 5), (6, 8), (9, 11), (12, 14), (15, 17), (18, 21),],),
+    ],
 )
 def test_split_range(total_pages, nb_pages, expected_ranges):
     actual_ranges = list(utils.split_range(total_pages, nb_pages))
diff --git a/swh/lister/utils.py b/swh/lister/utils.py
--- a/swh/lister/utils.py
+++ b/swh/lister/utils.py
@@ -1,13 +1,15 @@
-# Copyright (C) 2018 the Software Heritage developers
+# Copyright (C) 2018-2020 the Software Heritage developers
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+from typing import Iterator, Tuple
 
-def split_range(total_pages, nb_pages):
+
+def split_range(total_pages: int, nb_pages: int) -> Iterator[Tuple[int, int]]:
     prev_index = None
     for index in range(0, total_pages, nb_pages):
         if index is not None and prev_index is not None:
-            yield prev_index, index
+            yield prev_index, index - 1
         prev_index = index
 
     if index != total_pages: