diff --git a/src/borg/locking.py b/src/borg/locking.py
index 6c4c77826..ae3de7a13 100644
--- a/src/borg/locking.py
+++ b/src/borg/locking.py
@@ -197,7 +197,7 @@ class ExclusiveLock:
                     host_pid, thread_str = name.rsplit("-", 1)
                     host, pid_str = host_pid.rsplit(".", 1)
                     pid = int(pid_str)
-                    thread = int(thread_str)
+                    thread = int(thread_str, 16)
                 except ValueError:
                     # Malformed lock name? Or just some new format we don't understand?
                     logger.error("Found malformed lock %s in %s. Please check/fix manually.", name, self.path)