diff --git a/src/borg/helpers/fs.py b/src/borg/helpers/fs.py
index 7fde44963..cf578ed2a 100644
--- a/src/borg/helpers/fs.py
+++ b/src/borg/helpers/fs.py
@@ -442,15 +442,6 @@ class HardLinkManager:
         self.id_type = id_type
         self.info_type = info_type  # can be a single type or a tuple of types
 
-    def borg1_hardlinkable(self, mode):  # legacy
-        return stat.S_ISREG(mode) or stat.S_ISBLK(mode) or stat.S_ISCHR(mode) or stat.S_ISFIFO(mode)
-
-    def borg1_hardlink_master(self, item):  # legacy
-        return item.get("hardlink_master", False) and "source" not in item and self.borg1_hardlinkable(item.mode)
-
-    def borg1_hardlink_slave(self, item):  # legacy
-        return "source" in item and self.borg1_hardlinkable(item.mode)
-
     def hardlink_id_from_path(self, path):
         """compute a hard link id from a path"""
         assert isinstance(path, str)
diff --git a/src/borg/legacy/helpers.py b/src/borg/legacy/helpers.py
new file mode 100644
index 000000000..f0cdebf9c
--- /dev/null
+++ b/src/borg/legacy/helpers.py
@@ -0,0 +1,13 @@
+import stat
+
+
+def borg1_hardlinkable(mode):
+    return stat.S_ISREG(mode) or stat.S_ISBLK(mode) or stat.S_ISCHR(mode) or stat.S_ISFIFO(mode)
+
+
+def borg1_hardlink_master(item):
+    return item.get("hardlink_master", False) and "source" not in item and borg1_hardlinkable(item.mode)
+
+
+def borg1_hardlink_slave(item):
+    return "source" in item and borg1_hardlinkable(item.mode)
diff --git a/src/borg/legacy/upgrade.py b/src/borg/legacy/upgrade.py
index 5ebd91ead..80c3357ee 100644
--- a/src/borg/legacy/upgrade.py
+++ b/src/borg/legacy/upgrade.py
@@ -6,6 +6,7 @@ from ..compress import ZLIB, ZLIB_legacy, ObfuscateSize
 from ..helpers import HardLinkManager, join_cmd
 from ..item import Item
 from ..logger import create_logger
+from .helpers import borg1_hardlink_master, borg1_hardlink_slave
 
 logger = create_logger(__name__)
 
@@ -47,10 +48,10 @@ class UpgraderFrom12To20:
             "acl_extended",
         }
 
-        if self.hlm.borg1_hardlink_master(item):
+        if borg1_hardlink_master(item):
             item.hlid = hlid = self.hlm.hardlink_id_from_path(item.path)
             self.hlm.remember(id=hlid, info=item.get("chunks"))
-        elif self.hlm.borg1_hardlink_slave(item):
+        elif borg1_hardlink_slave(item):
             item.hlid = hlid = self.hlm.hardlink_id_from_path(item.source)
             chunks = self.hlm.retrieve(id=hlid)
             if chunks is not None: