diff --git a/ui/bin/opensnitch-ui b/ui/bin/opensnitch-ui
index 61d70c41ae..1a46c4087c 100755
--- a/ui/bin/opensnitch-ui
+++ b/ui/bin/opensnitch-ui
@@ -69,7 +69,6 @@ Examples:
         import faulthandler
         faulthandler.enable()
 
-    os.environ["QT_QPA_PLATFORM"] = "xcb"
     os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"
     if supported_qt_version(5,6,0):
         try:
diff --git a/ui/opensnitch/dialogs/prompt.py b/ui/opensnitch/dialogs/prompt.py
index 8644862116..73e67e4f3c 100644
--- a/ui/opensnitch/dialogs/prompt.py
+++ b/ui/opensnitch/dialogs/prompt.py
@@ -152,8 +152,7 @@ def adjust_size(self):
             self._width = self.width()
             self._height = self.height()
 
-        self.setMinimumSize(self._width, self._height)
-        self.setMaximumSize(self._width, self._height)
+        self.resize(QtCore.QSize(self._width, self._height))
 
     def move_popup(self):
         popup_pos = self._cfg.getInt(self._cfg.DEFAULT_POPUP_POSITION)