diff --git a/swh/loader/mercurial/utils.py b/swh/loader/mercurial/utils.py
index d0a52c0..e32d480 100644
--- a/swh/loader/mercurial/utils.py
+++ b/swh/loader/mercurial/utils.py
@@ -1,44 +1,45 @@
 # Copyright (C) 2020-2021  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from datetime import datetime, timezone
 import os
 from typing import Dict, Optional, Union
 
 from dateutil.parser import parse
 
 
 def parse_visit_date(visit_date: Optional[Union[datetime, str]]) -> Optional[datetime]:
     """Convert visit date from either None, a string or a datetime to either None or
        datetime.
 
     """
     if visit_date is None:
         return None
 
     if isinstance(visit_date, datetime):
         return visit_date
 
     if visit_date == "now":
         return datetime.now(tz=timezone.utc)
 
     if isinstance(visit_date, str):
         return parse(visit_date)
 
     raise ValueError(f"invalid visit date {visit_date!r}")
 
 
 def get_minimum_env() -> Dict[str, str]:
     """Return the smallest viable environment for `hg` suprocesses"""
     env = {
         "HGPLAIN": "",  # Tells Mercurial to disable output customization
-        "HGRCPATH": "",  # Tells Mercurial to ignore config files
+        "HGRCPATH": "",  # Tells Mercurial to ignore user's config files
+        "HGRCSKIPREPO": "",  # Tells Mercurial to ignore repo's config file
     }
     path = os.environ.get("PATH")
     if path:
         # Sometimes (in tests for example), there is no PATH. An empty PATH could be
         # interpreted differently than a lack of PATH by some programs.
         env["PATH"] = path
     return env