diff --git a/src/main/java/net/minecraft/network/play/server/S3FPacketCustomPayload.java b/src/main/java/net/minecraft/network/play/server/S3FPacketCustomPayload.java
index a77c325..fad3d9e 100644
--- a/src/main/java/net/minecraft/network/play/server/S3FPacketCustomPayload.java
+++ b/src/main/java/net/minecraft/network/play/server/S3FPacketCustomPayload.java
@@ -27,23 +27,24 @@
 		this.field_149172_a = p_i45190_1_;
 		this.field_149171_b = p_i45190_2_;
 
-		if (p_i45190_2_.length >= 1048576)
+		//TODO: Remove this when FML protocol is re-written. To restore vanilla compatibility.
+		if (p_i45190_2_.length > 0x1FFF9A) // Max size of ANY MC packet is 0x1FFFFF minus max size of this packet (101)
 		{
-			throw new IllegalArgumentException("Payload may not be larger than 1048576 bytes");
+			throw new IllegalArgumentException("Payload may not be larger than 2097050 bytes");
 		}
 	}
 
 	public void readPacketData(PacketBuffer p_148837_1_) throws IOException
 	{
 		this.field_149172_a = p_148837_1_.readStringFromBuffer(20);
-		this.field_149171_b = new byte[p_148837_1_.readUnsignedShort()];
+		this.field_149171_b = new byte[cpw.mods.fml.common.network.ByteBufUtils.readVarShort(p_148837_1_)];
 		p_148837_1_.readBytes(this.field_149171_b);
 	}
 
 	public void writePacketData(PacketBuffer p_148840_1_) throws IOException
 	{
 		p_148840_1_.writeStringToBuffer(this.field_149172_a);
-		p_148840_1_.writeShort(this.field_149171_b.length);
+		cpw.mods.fml.common.network.ByteBufUtils.writeVarShort(p_148840_1_, this.field_149171_b.length);
 		p_148840_1_.writeBytes(this.field_149171_b);
 	}
 
diff --git a/src/main/resources/fmlversion.properties b/src/main/resources/fmlversion.properties
index ffef58b..aa1c981 100644
--- a/src/main/resources/fmlversion.properties
+++ b/src/main/resources/fmlversion.properties
@@ -1,6 +1,6 @@
 fmlbuild.major.number=7
 fmlbuild.minor.number=10
-fmlbuild.revision.number=23
-fmlbuild.build.number=62
+fmlbuild.revision.number=24
+fmlbuild.build.number=63
 fmlbuild.mcversion=1.7.10
 fmlbuild.mcpversion=9.05