diff --git a/src/calibre/gui2/ui.py b/src/calibre/gui2/ui.py
index 353e0b20b6..cd22760e22 100644
--- a/src/calibre/gui2/ui.py
+++ b/src/calibre/gui2/ui.py
@@ -566,8 +566,7 @@ class Main(MainWindow, MainWindowMixin, DeviceMixin, EmailMixin,  # {{{
                 files = [os.path.abspath(p) for p in argv[1:] if not os.path.isdir(p) and os.access(p, os.R_OK)]
                 if files:
                     self.iactions['Add Books'].add_filesystem_book(files)
-            self.setWindowState(self.windowState() &
-                    ~Qt.WindowMinimized|Qt.WindowActive)
+            self.setWindowState(self.windowState() & ~Qt.WindowMinimized|Qt.WindowActive)
             self.show_windows()
             self.raise_()
             self.activateWindow()