diff --git a/igniter/update_window.py b/igniter/update_window.py
index 9cf4abf244..d51ae18cd0 100644
--- a/igniter/update_window.py
+++ b/igniter/update_window.py
@@ -49,7 +49,6 @@ class UpdateWindow(QtWidgets.QDialog):
 
         self._update_thread = None
 
-        self.resize(QtCore.QSize(self._width, self._height))
         self._init_ui()
 
         # Set stylesheet
@@ -81,6 +80,16 @@ class UpdateWindow(QtWidgets.QDialog):
 
         self._progress_bar = progress_bar
 
+    def showEvent(self, event):
+        super().showEvent(event)
+        current_size = self.size()
+        new_size = QtCore.QSize(
+            max(current_size.width(), self._width),
+            max(current_size.height(), self._height)
+        )
+        if current_size != new_size:
+            self.resize(new_size)
+
     def _run_update(self):
         """Start install process.