diff --git a/qutebrowser/widgets/mainwindow.py b/qutebrowser/widgets/mainwindow.py
index f16db872c..ea1955ee5 100644
--- a/qutebrowser/widgets/mainwindow.py
+++ b/qutebrowser/widgets/mainwindow.py
@@ -57,7 +57,7 @@ class MainWindow(QWidget):
             geom = base64.b64decode(data, validate=True)
         except KeyError:
             # First start
-            pass
+            self._set_default_geometry()
         except binascii.Error:
             log.init.exception("Error while reading geometry")
             self._set_default_geometry()