diff --git a/navi/tools/ssh_exec.py b/navi/tools/ssh_exec.py
index e2a6dd7..00414ad 100644
--- a/navi/tools/ssh_exec.py
+++ b/navi/tools/ssh_exec.py
@@ -74,7 +74,7 @@
         entry = _pool.get(key)
         if entry is not None:
             age = time.monotonic() - entry.created_at
-            if age > _TTL or entry.conn.is_closing():
+            if age > _TTL or entry.conn.is_closed():
                 # Expired or already closed — drop it
                 try:
                     entry.conn.close()