diff --git a/cloud/autoscaler.py b/cloud/autoscaler.py
index fdd72e7..ff66f66 100644
--- a/cloud/autoscaler.py
+++ b/cloud/autoscaler.py
@@ -159,7 +159,7 @@ class Autoscaler:
         log_handle = None
         if self.log_dir:
             log_path = os.path.join(
-                self.log_dir, "autoscale-%s.log" % worker_id)
+                self.log_dir, "%s.log" % worker_id)
             log_handle = open(log_path, "ab")
         proc = subprocess.Popen(
             cmd, stdout=log_handle, stderr=subprocess.STDOUT,