diff --git a/ClassicalSharp/Blocks/BlockInfo.cs b/ClassicalSharp/Blocks/BlockInfo.cs
index 0e4a9ff33..42118b422 100644
--- a/ClassicalSharp/Blocks/BlockInfo.cs
+++ b/ClassicalSharp/Blocks/BlockInfo.cs
@@ -188,5 +188,21 @@ namespace ClassicalSharp {
 		public string GetName( byte id ) {
 			return names[id];
 		}
+		
+		public void ResetBlockInfo( byte id ) {
+			isTransparent[id] = false;
+			isTranslucent[id] = false;
+			isOpaque[id] = true;
+			isSprite[id] = false;
+			isLiquid[id] = false;
+			heights[id] = 1;
+			blocksLight[id] = true;
+			emitsLight[id] = true;
+			names[id] = "Invalid";
+			fogColours[id] = default( FastColour );
+			fogDensities[id] = 0;
+			SetAll( 0, (Block)id );
+			SetupCullingCache();		
+		}
 	}
 }
\ No newline at end of file
diff --git a/ClassicalSharp/Network/Enums.cs b/ClassicalSharp/Network/Enums.cs
index fee60ec22..d37813e95 100644
--- a/ClassicalSharp/Network/Enums.cs
+++ b/ClassicalSharp/Network/Enums.cs
@@ -41,6 +41,7 @@ namespace ClassicalSharp {
 		CpePlayerClick = 34,
 		CpeDefineBlock = 35,
 		CpeDefineLiquid = 36,
+		CpeRemoveBlockDefinition = 37,
 	}
 	
 	public enum CpeMessage {
diff --git a/ClassicalSharp/Network/NetworkProcessor.cs b/ClassicalSharp/Network/NetworkProcessor.cs
index 5d3a1f1ba..5a3234e09 100644
--- a/ClassicalSharp/Network/NetworkProcessor.cs
+++ b/ClassicalSharp/Network/NetworkProcessor.cs
@@ -116,7 +116,7 @@ namespace ClassicalSharp {
 		readonly int[] packetSizes = {
 			131, 1, 1, 1028, 7, 9, 8, 74, 10, 7, 5, 4, 2,
 			66, 65, 2, 67, 69, 3, 2, 3, 134, 196, 130, 3,
-			8, 86, 2, 4, 66, 69, 2, 8, 138, 0, 76, 78,
+			8, 86, 2, 4, 66, 69, 2, 8, 138, 0, 76, 78, 2,
 		};
 		
 		static string[] clientExtensions = {
@@ -643,6 +643,8 @@ namespace ClassicalSharp {
 					{
 						byte block = reader.ReadUInt8();
 						BlockInfo info = game.BlockInfo;
+						info.ResetBlockInfo( block );
+						
 						info.names[block] = reader.ReadAsciiString();
 						byte solidity = reader.ReadUInt8();
 						byte movementSpeed = reader.ReadUInt8();
@@ -676,6 +678,12 @@ namespace ClassicalSharp {
 						}
 					} break;
 					
+				case PacketId.CpeRemoveBlockDefinition:
+					{
+						byte block = reader.ReadUInt8();
+						game.BlockInfo.ResetBlockInfo( block );
+					} break;
+					
 				default:
 					throw new NotImplementedException( "Unsupported packet:" + (PacketId)opcode );
 			}