diff --git a/sshfs/spec.py b/sshfs/spec.py
index 046a6ec..88f7f2b 100644
--- a/sshfs/spec.py
+++ b/sshfs/spec.py
@@ -100,7 +100,8 @@ async def _connect(
 
     connect = sync_wrapper(_connect)
 
-    async def _finalize(self, pool, stack):
+    @staticmethod
+    async def _finalize(pool, stack):
         await pool.close()
 
         # If an error occurs while the SSHFile is trying to