diff --git a/java/src/com/tightvnc/rfbplayer/RfbProto.java b/java/src/com/tightvnc/rfbplayer/RfbProto.java
index e776ef6..952dc8d 100644
--- a/java/src/com/tightvnc/rfbplayer/RfbProto.java
+++ b/java/src/com/tightvnc/rfbplayer/RfbProto.java
@@ -50,6 +50,8 @@
       0xFFFFFF18,  EncodingLastRect = 0xFFFFFF20,  EncodingNewFBSize =
       0xFFFFFF21;
 
+  final static int MaxNormalEncoding = 7;
+
   final int HextileRaw = (1 << 0);
   final int HextileBackgroundSpecified = (1 << 1);
   final int HextileForegroundSpecified = (1 << 2);
@@ -214,8 +216,7 @@
     updateRectH = is.readUnsignedShort();
     updateRectEncoding = is.readInt();
 
-    if ((updateRectEncoding == EncodingLastRect) ||
-        (updateRectEncoding == EncodingNewFBSize))
+    if (updateRectEncoding < 0 || updateRectEncoding > MaxNormalEncoding)
       return;
 
     if ((updateRectX + updateRectW > framebufferWidth) ||