diff --git a/aiocraft/mc/proto/play/clientbound/packet_multi_block_change.py b/aiocraft/mc/proto/play/clientbound/packet_multi_block_change.py
index 033a6df..c0ef264 100644
--- a/aiocraft/mc/proto/play/clientbound/packet_multi_block_change.py
+++ b/aiocraft/mc/proto/play/clientbound/packet_multi_block_change.py
@@ -8,7 +8,7 @@ from ....types import *
 class PacketMultiBlockChange(Packet):
 	__slots__ = ( 'id', 'chunkCoordinates', 'chunkX', 'chunkZ', 'notTrustEdges', 'records', 'suppressLightUpdates' )
 	
-	chunkCoordinates : bytes
+	chunkCoordinates : int
 	chunkX : int
 	chunkZ : int
 	notTrustEdges : bool
@@ -16,7 +16,7 @@ class PacketMultiBlockChange(Packet):
 	suppressLightUpdates : bool
 
 	def __init__(self, proto:int,
-		chunkCoordinates:bytes=None,
+		chunkCoordinates:int=None,
 		chunkX:int=None,
 		chunkZ:int=None,
 		notTrustEdges:bool=None,
diff --git a/compiler/proto.py b/compiler/proto.py
index 104a048..4d0b37e 100644
--- a/compiler/proto.py
+++ b/compiler/proto.py
@@ -197,6 +197,8 @@ def mchint(slot_type:Any) -> Ref:
 			else:
 				possibilities.add(Ref('None'))
 			return Ref(f'Union[{", ".join(str(s) for s in sorted(possibilities))}]')
+		elif t == "bitfield":
+			return Ref('int')
 		# elif t == "mapper": # ????
 		# 	return TrailingData
 	logging.error("Unknown type %s, using 'bytes' as hint", str(slot_type))