diff --git a/src/yunohost/data_migrations/0021_migrate_to_bullseye.py b/src/yunohost/data_migrations/0021_migrate_to_bullseye.py
index e47087976..82847c9a6 100644
--- a/src/yunohost/data_migrations/0021_migrate_to_bullseye.py
+++ b/src/yunohost/data_migrations/0021_migrate_to_bullseye.py
@@ -5,7 +5,7 @@ from moulinette import m18n
 from yunohost.utils.error import YunohostError
 from moulinette.utils.log import getActionLogger
 from moulinette.utils.process import check_output, call_async_output
-from moulinette.utils.filesystem import read_file, rm
+from moulinette.utils.filesystem import read_file, rm, write_to_file
 
 from yunohost.tools import (
     Migration,
@@ -81,6 +81,16 @@ class MyMigration(Migration):
             "echo 'libc6 libraries/restart-without-asking boolean true' | debconf-set-selections"
         )
 
+        # Do not restart nginx during the upgrade of nginx-common ...
+        # c.f. https://manpages.debian.org/bullseye/init-system-helpers/deb-systemd-invoke.1p.en.html
+        # and the code inside /usr/bin/deb-systemd-invoke to see how it calls /usr/sbin/policy-rc.d ...
+        write_to_file(
+            '/usr/sbin/policy-rc.d',
+            '#!/bin/bash\n[[ "$1" == "nginx" ]] && return 101 || return 0'
+        )
+        os.system("chmod +x /usr/sbin/policy-rc.d")
+        # FIXME: we still need to explicitly restart nginx somewhere ...
+
         # Don't send an email to root about the postgresql migration. It should be handled automatically after.
         os.system(
             "echo 'postgresql-common postgresql-common/obsolete-major seen true' | debconf-set-selections"