# HG changeset patch
# Parent 73e3457f7840e7365128dad8f8565cbe79b62140
# User Socolin
diff --git a/minecraft/net/minecraft/src/Packet56MapChunks.java b/minecraft/net/minecraft/src/Packet56MapChunks.java
--- a/minecraft/net/minecraft/src/Packet56MapChunks.java
+++ b/minecraft/net/minecraft/src/Packet56MapChunks.java
@@ -104,24 +104,30 @@ public class Packet56MapChunks extends P
 
         for (int chunkId = 0; chunkId < countReceivedChunk; ++chunkId)
         {
             this.chunkPostX[chunkId] = par1DataInputStream.readInt();
             this.chunkPosZ[chunkId] = par1DataInputStream.readInt();
             this.chunkExistFlag[chunkId] = par1DataInputStream.readShort();
             this.chunkAddSectionFlag[chunkId] = par1DataInputStream.readShort();
             int chunkDataBlockCount = 0;
+            int chunkDataAddSectionCount = 0;
             int chunkBitId;
 
             for (chunkBitId = 0; chunkBitId < 16; ++chunkBitId)
             {
                 chunkDataBlockCount += this.chunkExistFlag[chunkId] >> chunkBitId & 1;
             }
 
-            int chunkDataSize = 2048 * 5 * chunkDataBlockCount + 256;
+            for (chunkBitId = 0; chunkBitId < 16; ++chunkBitId)
+            {
+                chunkDataAddSectionCount += this.chunkAddSectionFlag[chunkId] >> chunkBitId & 1;
+            }
+
+            int chunkDataSize = 2048 * 5 * chunkDataBlockCount + 2048 * chunkDataAddSectionCount + 256;
             this.chunkCompressedData[chunkId] = new byte[chunkDataSize];
             System.arraycopy(decompressedData, offsetInDecompressedBuffer, this.chunkCompressedData[chunkId], 0, chunkDataSize);
             offsetInDecompressedBuffer += chunkDataSize;
         }
     }
 
     public void writePacketData(DataOutputStream par1DataOutputStream) throws IOException
     {