diff --git a/data/pc/1.21.11/protocol.json b/data/pc/1.21.11/protocol.json
index a8932ce72..8ad0c2d64 100644
--- a/data/pc/1.21.11/protocol.json
+++ b/data/pc/1.21.11/protocol.json
@@ -10466,7 +10466,7 @@
             },
             {
               "name": "checksum",
-              "type": "u8"
+              "type": "i8"
             }
           ]
         ],
diff --git a/data/pc/1.21.9/proto.yml b/data/pc/1.21.9/proto.yml
index b1a950bb0..d7027026b 100644
--- a/data/pc/1.21.9/proto.yml
+++ b/data/pc/1.21.9/proto.yml
@@ -3324,7 +3324,7 @@
             "count": 3
          }
       ]
-      checksum: u8
+      checksum: i8
    # MC: ServerboundChatSessionUpdatePacket
    packet_chat_session_update:
       sessionUUID: UUID
diff --git a/data/pc/1.21.9/protocol.json b/data/pc/1.21.9/protocol.json
index c2f2341fd..5a824c611 100644
--- a/data/pc/1.21.9/protocol.json
+++ b/data/pc/1.21.9/protocol.json
@@ -10176,7 +10176,7 @@
             },
             {
               "name": "checksum",
-              "type": "u8"
+              "type": "i8"
             }
           ]
         ],
diff --git a/data/pc/latest/proto.yml b/data/pc/latest/proto.yml
index 994af59e5..1df0d5a53 100644
--- a/data/pc/latest/proto.yml
+++ b/data/pc/latest/proto.yml
@@ -3401,7 +3401,7 @@
             "count": 3
          }
       ]
-      checksum: u8
+      checksum: i8
    # MC: ServerboundChatSessionUpdatePacket
    packet_chat_session_update:
       sessionUUID: UUID