diff --git a/src/yunohost/data_migrations/0015_migrate_to_buster.py b/src/yunohost/data_migrations/0015_migrate_to_buster.py
index 836660701..bbbf8bf16 100644
--- a/src/yunohost/data_migrations/0015_migrate_to_buster.py
+++ b/src/yunohost/data_migrations/0015_migrate_to_buster.py
@@ -50,7 +50,7 @@ class MyMigration(Migration):
         # which for apt appears as a lower version (hence the --allow-downgrades and the hardcoded version number)
         unscd_version = check_output('dpkg -s unscd | grep "^Version: " | cut -d " " -f 2')
         if "yunohost" in unscd_version:
-            new_version = check_output("apt policy unscd 2>/dev/null | grep -v '\\*\\*\\*' | grep -A100 'Version table' | grep http -B1 | head -n 1 | awk '{print $1}'").strip()
+            new_version = check_output("LC_ALL=C apt policy unscd 2>/dev/null | grep -v '\\*\\*\\*' | grep http -B1 | head -n 1 | awk '{print $1}'").strip()
             if new_version:
                 self.apt_install('unscd=%s --allow-downgrades' % new_version)
             else: