diff --git a/swh/lister/core/paging_lister.py b/swh/lister/core/paging_lister.py
--- a/swh/lister/core/paging_lister.py
+++ b/swh/lister/core/paging_lister.py
@@ -110,7 +110,7 @@
             nothing
 
         """
-        page = min_bound or ''
+        page = min_bound or 0
         loop_count = 0
 
         self.min_page = min_bound