diff --git a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_10to1_11/packets/BlockItemPackets1_11.java b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_10to1_11/packets/BlockItemPackets1_11.java
index 9945c7e1..5a626153 100644
--- a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_10to1_11/packets/BlockItemPackets1_11.java
+++ b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_10to1_11/packets/BlockItemPackets1_11.java
@@ -139,7 +139,7 @@ public class BlockItemPackets1_11 extends BlockItemRewriter<Protocol1_10To1_11>
                         if (wrapper.get(Type.STRING, 0).equalsIgnoreCase("MC|TrList")) {
                             wrapper.passthrough(Type.INT); // Passthrough Window ID
 
-                            int size = wrapper.passthrough(Type.BYTE);
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
                             for (int i = 0; i < size; i++) {
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Input Item
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Output Item
diff --git a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11_1to1_12/packets/BlockItemPackets1_12.java b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11_1to1_12/packets/BlockItemPackets1_12.java
index e297e819..b930597b 100644
--- a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11_1to1_12/packets/BlockItemPackets1_12.java
+++ b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11_1to1_12/packets/BlockItemPackets1_12.java
@@ -140,7 +140,7 @@ public class BlockItemPackets1_12 extends BlockItemRewriter<Protocol1_11_1To1_12
                         if (wrapper.get(Type.STRING, 0).equalsIgnoreCase("MC|TrList")) {
                             wrapper.passthrough(Type.INT); // Passthrough Window ID
 
-                            int size = wrapper.passthrough(Type.BYTE);
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
                             for (int i = 0; i < size; i++) {
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Input Item
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Output Item
diff --git a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11to1_11_1/packets/ItemPackets1_11_1.java b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11to1_11_1/packets/ItemPackets1_11_1.java
index fc432638..7e4697db 100644
--- a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11to1_11_1/packets/ItemPackets1_11_1.java
+++ b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_11to1_11_1/packets/ItemPackets1_11_1.java
@@ -90,7 +90,7 @@ public class ItemPackets1_11_1 extends BlockItemRewriter<Protocol1_11To1_11_1> {
                         if (wrapper.get(Type.STRING, 0).equalsIgnoreCase("MC|TrList")) {
                             wrapper.passthrough(Type.INT); // Passthrough Window ID
 
-                            int size = wrapper.passthrough(Type.BYTE);
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
                             for (int i = 0; i < size; i++) {
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Input Item
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Output Item
diff --git a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_9_4to1_10/packets/BlockItemPackets1_10.java b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_9_4to1_10/packets/BlockItemPackets1_10.java
index 78673b34..e0b23f4e 100644
--- a/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_9_4to1_10/packets/BlockItemPackets1_10.java
+++ b/core/src/main/java/nl/matsv/viabackwards/protocol/protocol1_9_4to1_10/packets/BlockItemPackets1_10.java
@@ -96,7 +96,7 @@ public class BlockItemPackets1_10 extends BlockItemRewriter<Protocol1_9_4To1_10>
                         if (wrapper.get(Type.STRING, 0).equalsIgnoreCase("MC|TrList")) {
                             wrapper.passthrough(Type.INT); // Passthrough Window ID
 
-                            int size = wrapper.passthrough(Type.BYTE);
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
                             for (int i = 0; i < size; i++) {
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Input Item
                                 wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Output Item