diff --git a/swh/lister/core/lister_base.py b/swh/lister/core/lister_base.py
--- a/swh/lister/core/lister_base.py
+++ b/swh/lister/core/lister_base.py
@@ -70,7 +70,6 @@
                               ' customized for a specific service.')
     LISTER_NAME = AbstractAttribute("Lister's name")
 
-    @abc.abstractmethod
     def transport_request(self, identifier):
         """Given a target endpoint identifier to query, try once to request it.
 
@@ -91,7 +90,6 @@
         """
         pass
 
-    @abc.abstractmethod
     def transport_response_to_string(self, response):
         """Convert the server response into a formatted string for logging.
 
@@ -105,7 +103,6 @@
         """
         pass
 
-    @abc.abstractmethod
     def transport_response_simplified(self, response):
         """Convert the server response into list of a dict for each repo in the
             response, mapping columns in the lister's MODEL class to repo data.
@@ -122,7 +119,6 @@
         """
         pass
 
-    @abc.abstractmethod
     def transport_quota_check(self, response):
         """Check server response to see if we're hitting request rate limits.
 
diff --git a/swh/lister/core/simple_lister.py b/swh/lister/core/simple_lister.py
--- a/swh/lister/core/simple_lister.py
+++ b/swh/lister/core/simple_lister.py
@@ -2,7 +2,6 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-import abc
 import logging
 
 from swh.core import utils
@@ -20,7 +19,6 @@
       information and stores those in db
 
     """
-    @abc.abstractmethod
     def list_packages(self, *args):
         """Listing packages method.