diff --git a/gunicorn/arbiter.py b/gunicorn/arbiter.py
index 46ac2ee8..4b71f2b5 100644
--- a/gunicorn/arbiter.py
+++ b/gunicorn/arbiter.py
@@ -248,6 +248,7 @@ class Arbiter(object):
         Kill all workers by sending them a SIGUSR1
         """
         self.kill_workers(signal.SIGUSR1)
+        self.log.reopen_files()
     
     def handle_usr2(self):
         """\