diff --git a/src/calibre/gui2/ui.py b/src/calibre/gui2/ui.py
index 1efdfcd5da..d992f9e1cc 100644
--- a/src/calibre/gui2/ui.py
+++ b/src/calibre/gui2/ui.py
@@ -18,7 +18,7 @@ import sys
 import textwrap
 import time
 from collections import (
-  OrderedDict, deque
+    OrderedDict, deque
 )
 from io import BytesIO
 from qt.core import (