diff --git a/src/calibre/gui2/main.py b/src/calibre/gui2/main.py
index 195be03626..94c2ffa384 100644
--- a/src/calibre/gui2/main.py
+++ b/src/calibre/gui2/main.py
@@ -138,8 +138,8 @@ class GuiRunner(QObject):
         if self.splash_screen is not None:
             self.splash_screen.finish(main)
         if DEBUG:
-            prints('Started up in', time.time() - self.startup_time, 'with',
-                    len(db.data), 'books')
+            prints('Started up in %.2f seconds'%(time.time() -
+                self.startup_time), 'with', len(db.data), 'books')
         add_filesystem_book = partial(main.iactions['Add Books'].add_filesystem_book, allow_device=False)
         sys.excepthook = main.unhandled_exception
         if len(self.args) > 1: