diff --git a/src/calibre/srv/loop.py b/src/calibre/srv/loop.py
index 0a15cc1167..bf27245481 100644
--- a/src/calibre/srv/loop.py
+++ b/src/calibre/srv/loop.py
@@ -274,6 +274,7 @@ class ServerLoop(object):
                     select.select([s], [], [], 0)
                 except select.error:
                     self.close(s, conn)  # Bad socket, discard
+            return
 
         if not self.ready:
             return