diff --git a/tools/generate_port_sources.py b/tools/generate_port_sources.py
index 230f94f..8e3d064 100644
--- a/tools/generate_port_sources.py
+++ b/tools/generate_port_sources.py
@@ -114,6 +114,7 @@ def write_generated_registries(blocks: list[str], block_kinds: dict[str, str], i
     lines: list[str] = [
         "package net.mcreator.crustychunks.init;",
         "",
+        "import com.mojang.serialization.MapCodec;",
         "import net.mcreator.crustychunks.CrustyChunksMod;",
         "import net.minecraft.core.Direction;",
         "import net.minecraft.core.registries.Registries;",
@@ -191,12 +192,19 @@ def write_generated_registries(blocks: list[str], block_kinds: dict[str, str], i
         "    }",
         "",
         "    private static final class GeneratedHorizontalBlock extends HorizontalDirectionalBlock {",
+        "        private static final MapCodec<GeneratedHorizontalBlock> CODEC = simpleCodec(GeneratedHorizontalBlock::new);",
+        "",
         "        private GeneratedHorizontalBlock(BlockBehaviour.Properties properties) {",
         "            super(properties);",
         "            registerDefaultState(stateDefinition.any().setValue(FACING, Direction.NORTH));",
         "        }",
         "",
         "        @Override",
+        "        protected MapCodec<? extends GeneratedHorizontalBlock> codec() {",
+        "            return CODEC;",
+        "        }",
+        "",
+        "        @Override",
         "        public BlockState getStateForPlacement(BlockPlaceContext context) {",
         "            return defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite());",
         "        }",
@@ -208,12 +216,19 @@ def write_generated_registries(blocks: list[str], block_kinds: dict[str, str], i
         "    }",
         "",
         "    private static final class GeneratedFaceAttachedHorizontalBlock extends FaceAttachedHorizontalDirectionalBlock {",
+        "        private static final MapCodec<GeneratedFaceAttachedHorizontalBlock> CODEC = simpleCodec(GeneratedFaceAttachedHorizontalBlock::new);",
+        "",
         "        private GeneratedFaceAttachedHorizontalBlock(BlockBehaviour.Properties properties) {",
         "            super(properties);",
         "            registerDefaultState(stateDefinition.any().setValue(FACING, Direction.NORTH).setValue(FACE, AttachFace.FLOOR));",
         "        }",
         "",
         "        @Override",
+        "        protected MapCodec<? extends GeneratedFaceAttachedHorizontalBlock> codec() {",
+        "            return CODEC;",
+        "        }",
+        "",
+        "        @Override",
         "        protected void createBlockStateDefinition(StateDefinition.Builder<Block, BlockState> builder) {",
         "            builder.add(FACING, FACE);",
         "        }",