diff --git a/src/calibre/gui2/dialogs/exim.py b/src/calibre/gui2/dialogs/exim.py
index 9e76ffa452..8e9156679b 100644
--- a/src/calibre/gui2/dialogs/exim.py
+++ b/src/calibre/gui2/dialogs/exim.py
@@ -377,6 +377,7 @@ class EximDialog(Dialog):
         self.abort_disk_usage.set()
         Dialog.reject(self)
 
+
 if __name__ == '__main__':
     from calibre.gui2 import Application
     app = Application([])