diff --git a/Plain Craft Launcher 2/Modules/Minecraft/ModLaunch.vb b/Plain Craft Launcher 2/Modules/Minecraft/ModLaunch.vb
index fba118f..70db6db 100644
--- a/Plain Craft Launcher 2/Modules/Minecraft/ModLaunch.vb	
+++ b/Plain Craft Launcher 2/Modules/Minecraft/ModLaunch.vb	
@@ -1688,7 +1688,7 @@ NextVersion:
             Case 3 '自定义
                 GameSize = New Size(Math.Max(100, Setup.Get("LaunchArgumentWindowWidth")), Math.Max(100, Setup.Get("LaunchArgumentWindowHeight")))
             Case Else
-                GameSize = New Size(875, 540)
+                GameSize = New Size(854, 480)
         End Select
         If McVersionCurrent.Version.McCodeMain <= 12 AndAlso
             McLaunchJavaSelected.VersionCode <= 8 AndAlso McLaunchJavaSelected.Version.Revision >= 200 AndAlso McLaunchJavaSelected.Version.Revision <= 321 AndAlso