diff --git a/DeCraftLauncher/Utils/JavaCode.cs b/DeCraftLauncher/Utils/JavaCode.cs
index 48e4852..517f885 100644
--- a/DeCraftLauncher/Utils/JavaCode.cs
+++ b/DeCraftLauncher/Utils/JavaCode.cs
@@ -192,7 +192,7 @@ public static string GenerateAppletViewerHTML(string className, JarConfig jar, D
 	</head>
 	<body>
 		<!-- Generated by DECRAFT {GlobalVars.versionCode} -->
-		<applet style=""width: 100%; height: 100%;"" width=""{jar.windowW}"" height=""{jar.windowH}"" code=""{className}"" archive=""{jar.jarFileName}""></applet>
+		<applet style=""width: 100%; height: 100%;"" width=""{(jar.windowW > 0 ? jar.windowW : 960)}"" height=""{(jar.windowH > 0 ? jar.windowH : 540)}"" code=""{className}"" archive=""{jar.jarFileName}""></applet>
 	</body>
 </html>
 ";
