diff --git a/core/src/main/java/nl/matsv/viabackwards/api/data/MappedLegacyBlockItem.java b/core/src/main/java/nl/matsv/viabackwards/api/data/MappedLegacyBlockItem.java
index b0053dfb..75e90842 100644
--- a/core/src/main/java/nl/matsv/viabackwards/api/data/MappedLegacyBlockItem.java
+++ b/core/src/main/java/nl/matsv/viabackwards/api/data/MappedLegacyBlockItem.java
@@ -9,13 +9,14 @@ public class MappedLegacyBlockItem {
     private final int id;
     private final short data;
     private final String name;
-    private Block block;
+    private final Block block;
     private BlockEntityHandler blockEntityHandler;
 
-    public MappedLegacyBlockItem(int id, short data, String name) {
+    public MappedLegacyBlockItem(int id, short data, String name, boolean block) {
         this.id = id;
         this.data = data;
         this.name = name != null ? ChatColor.RESET + name : null;
+        this.block = block ? new Block(id, data) : null;
     }
 
     public int getId() {
@@ -34,11 +35,6 @@ public class MappedLegacyBlockItem {
         return block != null;
     }
 
-    // Mark this as a block item
-    public void setBlock() {
-        block = new Block(id, data);
-    }
-
     public Block getBlock() {
         return block;
     }
diff --git a/core/src/main/java/nl/matsv/viabackwards/api/rewriters/LegacyBlockItemRewriter.java b/core/src/main/java/nl/matsv/viabackwards/api/rewriters/LegacyBlockItemRewriter.java
index e343ffc0..e519f21d 100644
--- a/core/src/main/java/nl/matsv/viabackwards/api/rewriters/LegacyBlockItemRewriter.java
+++ b/core/src/main/java/nl/matsv/viabackwards/api/rewriters/LegacyBlockItemRewriter.java
@@ -47,6 +47,7 @@ public abstract class LegacyBlockItemRewriter<T extends BackwardsProtocol> exten
                 JsonPrimitive jsonData = object.getAsJsonPrimitive("data");
                 short data = jsonData != null ? jsonData.getAsShort() : 0;
                 String name = object.getAsJsonPrimitive("name").getAsString();
+                boolean block = object.getAsJsonPrimitive("block").getAsBoolean();
 
                 if (dataEntry.getKey().contains("-")) {
                     // Range of ids
@@ -57,16 +58,16 @@ public abstract class LegacyBlockItemRewriter<T extends BackwardsProtocol> exten
                     // Special block color handling
                     if (name.contains("%color%")) {
                         for (int i = from; i <= to; i++) {
-                            mappings.put(i, new MappedLegacyBlockItem(id, data, name.replace("%color%", BlockColors.get(i - from))));
+                            mappings.put(i, new MappedLegacyBlockItem(id, data, name.replace("%color%", BlockColors.get(i - from)), block));
                         }
                     } else {
-                        MappedLegacyBlockItem mappedBlockItem = new MappedLegacyBlockItem(id, data, name);
+                        MappedLegacyBlockItem mappedBlockItem = new MappedLegacyBlockItem(id, data, name, block);
                         for (int i = from; i <= to; i++) {
                             mappings.put(i, mappedBlockItem);
                         }
                     }
                 } else {
-                    mappings.put(Integer.parseInt(dataEntry.getKey()), new MappedLegacyBlockItem(id, data, name));
+                    mappings.put(Integer.parseInt(dataEntry.getKey()), new MappedLegacyBlockItem(id, data, name, block));
                 }
             }
         }
@@ -81,12 +82,6 @@ public abstract class LegacyBlockItemRewriter<T extends BackwardsProtocol> exten
         this(protocol, null, null);
     }
 
-    protected void markAsBlock(int... ids) {
-        for (int id : ids) {
-            replacementData.get(id).setBlock();
-        }
-    }
-
     @Override
     public Item handleItemToClient(Item item) {
         if (item == null) return null;
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 d70593c8..6fcdb82d 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
@@ -352,7 +352,8 @@ public class BlockItemPackets1_11 extends LegacyBlockItemRewriter<Protocol1_10To
     @Override
     protected void registerRewrites() {
         // Handle spawner block entity (map to itself with custom handler)
-        replacementData.computeIfAbsent(52, s -> new MappedLegacyBlockItem(52, (short) -1, null)).setBlockEntityHandler((b, tag) -> {
+        MappedLegacyBlockItem data = replacementData.computeIfAbsent(52, s -> new MappedLegacyBlockItem(52, (short) -1, null, false));
+        data.setBlockEntityHandler((b, tag) -> {
             EntityTypeNames.toClientSpawner(tag);
             return tag;
         });
diff --git a/core/src/main/resources/assets/viabackwards/data/legacy-mappings.json b/core/src/main/resources/assets/viabackwards/data/legacy-mappings.json
index 960c952c..c16ccae2 100644
--- a/core/src/main/resources/assets/viabackwards/data/legacy-mappings.json
+++ b/core/src/main/resources/assets/viabackwards/data/legacy-mappings.json
@@ -3,12 +3,14 @@
     "251": {
       "id": 159,
       "data": -1,
-      "name": "1.12 %vb_color% Concrete"
+      "name": "1.12 %vb_color% Concrete",
+      "block": true
     },
     "252": {
       "id": 35,
       "data": -1,
-      "name": "1.12 %vb_color% Concrete Powder"
+      "name": "1.12 %vb_color% Concrete Powder",
+      "block": true
     },
     "453": {
       "id": 340,
@@ -20,7 +22,8 @@
     },
     "235-250": {
       "id": 159,
-      "name": "1.12 %color% Glazed Terracotta"
+      "name": "1.12 %color% Glazed Terracotta",
+      "block": true
     }
   },
   "1.11.1": {
@@ -33,7 +36,8 @@
     "218": {
       "id": 23,
       "data": -1,
-      "name": "1.11 Observer"
+      "name": "1.11 Observer",
+      "block": true
     },
     "449": {
       "id": 32,
@@ -45,7 +49,8 @@
     },
     "219-234": {
       "id": 158,
-      "name": "1.11 %color% Shulker Box"
+      "name": "1.11 %color% Shulker Box",
+      "block": true
     }
   },
   "1.10": {
@@ -55,25 +60,30 @@
     },
     "217": {
       "id": 287,
-      "name": "1.10 Structure Void"
+      "name": "1.10 Structure Void",
+      "block": true
     },
     "213": {
       "id": 159,
       "data": 1,
-      "name": "1.10 Magma Block"
+      "name": "1.10 Magma Block",
+      "block": true
     },
     "214": {
       "id": 159,
       "data": 14,
-      "name": "1.10 Nether Wart Block"
+      "name": "1.10 Nether Wart Block",
+      "block": true
     },
     "215": {
       "id": 112,
-      "name": "1.10 Red Nether Bricks"
+      "name": "1.10 Red Nether Bricks",
+      "block": true
     },
     "216": {
       "id": 155,
-      "name": "1.10 Bone Block"
+      "name": "1.10 Bone Block",
+      "block": true
     }
   }
 }
\ No newline at end of file