diff --git a/java/com/tigervnc/vncviewer/Viewport.java b/java/com/tigervnc/vncviewer/Viewport.java
index bc19b64..ba29e0a 100644
--- a/java/com/tigervnc/vncviewer/Viewport.java
+++ b/java/com/tigervnc/vncviewer/Viewport.java
@@ -107,7 +107,7 @@
     }
     if (!cc.fullScreen)
       setLocation(x, y);
-    setBackground(Color.BLACK);
+    getContentPane().setBackground(Color.BLACK);
   }
 
   public static Window getFullScreenWindow() {