diff --git a/Common/src/main/java/einstein/mendable_anvils/MendableAnvilsCommon.java b/Common/src/main/java/einstein/mendable_anvils/MendableAnvilsCommon.java
index d64024b..db0e4d8 100644
--- a/Common/src/main/java/einstein/mendable_anvils/MendableAnvilsCommon.java
+++ b/Common/src/main/java/einstein/mendable_anvils/MendableAnvilsCommon.java
@@ -2,14 +2,18 @@
 
 import einstein.mendable_anvils.platform.Services;
 import net.minecraft.core.BlockPos;
-import net.minecraft.server.level.ServerLevel;
+import net.minecraft.core.dispenser.DispenseItemBehavior;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.sounds.SoundEvents;
 import net.minecraft.sounds.SoundSource;
+import net.minecraft.tags.TagKey;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.Items;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.AnvilBlock;
 import net.minecraft.world.level.block.Block;
@@ -31,16 +35,33 @@ public class MendableAnvilsCommon {
             Blocks.CHIPPED_ANVIL, Blocks.ANVIL,
             Blocks.DAMAGED_ANVIL, Blocks.CHIPPED_ANVIL
     );
+    private static final TagKey<Item> REPAIR_ITEMS = TagKey.create(Registries.ITEM, new ResourceLocation(MOD_ID, "anvil_repair_items"));
 
     public static void init() {
-        DispenserBlock.registerBehavior(Items.IRON_INGOT, new MendAnvilDispenseItemBehavior());
+    }
+
+    public static void onDatapackSync() {
+        // Clears the registry of mend anvil behaviors incase tags are different between single player worlds
+        Map<Item, DispenseItemBehavior> registry = Map.copyOf(DispenserBlock.DISPENSER_REGISTRY); // Copy of the registry so there are no issues caused by removing keys while looping
+        registry.forEach((item, behavior) -> {
+            if (behavior instanceof MendAnvilDispenseItemBehavior) {
+                DispenserBlock.DISPENSER_REGISTRY.remove(item);
+            }
+        });
+
+        BuiltInRegistries.ITEM.getTagOrEmpty(REPAIR_ITEMS).forEach(holder -> {
+            Item item = holder.value();
+            if (!DispenserBlock.DISPENSER_REGISTRY.containsKey(item)) {
+                DispenserBlock.registerBehavior(item, new MendAnvilDispenseItemBehavior());
+            }
+        });
     }
 
     public static InteractionResult onBlockClick(Player player, Level level, InteractionHand hand, BlockHitResult result) {
         ItemStack stack = player.getItemInHand(hand);
         BlockPos pos = result.getBlockPos();
 
-        if (stack.is(Items.IRON_INGOT) && player.isShiftKeyDown()) {
+        if (stack.is(REPAIR_ITEMS) && player.isShiftKeyDown()) {
             if (mendAnvil(level, pos)) {
                 if (!player.isCreative()) {
                     stack.shrink(1);
diff --git a/Common/src/main/resources/data/mendable_anvils/tags/items/anvil_repair_items.json b/Common/src/main/resources/data/mendable_anvils/tags/items/anvil_repair_items.json
new file mode 100644
index 0000000..549adc4
--- /dev/null
+++ b/Common/src/main/resources/data/mendable_anvils/tags/items/anvil_repair_items.json
@@ -0,0 +1,6 @@
+{
+  "replace": false,
+  "values": [
+    "minecraft:iron_ingot"
+  ]
+}
\ No newline at end of file
diff --git a/Fabric/src/main/java/einstein/mendable_anvils/MendableAnvilsFabric.java b/Fabric/src/main/java/einstein/mendable_anvils/MendableAnvilsFabric.java
index 1351fd1..81fc48d 100644
--- a/Fabric/src/main/java/einstein/mendable_anvils/MendableAnvilsFabric.java
+++ b/Fabric/src/main/java/einstein/mendable_anvils/MendableAnvilsFabric.java
@@ -1,6 +1,7 @@
 package einstein.mendable_anvils;
 
 import net.fabricmc.api.ModInitializer;
+import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
 import net.fabricmc.fabric.api.event.player.UseBlockCallback;
 
 public class MendableAnvilsFabric implements ModInitializer {
@@ -9,5 +10,7 @@ public class MendableAnvilsFabric implements ModInitializer {
     public void onInitialize() {
         MendableAnvilsCommon.init();
         UseBlockCallback.EVENT.register(MendableAnvilsCommon::onBlockClick);
+        ServerLifecycleEvents.SERVER_STARTED.register(server -> MendableAnvilsCommon.onDatapackSync());
+        ServerLifecycleEvents.END_DATA_PACK_RELOAD.register((server, resourceManager, success) -> MendableAnvilsCommon.onDatapackSync());
     }
 }
diff --git a/Forge/src/main/java/einstein/mendable_anvils/MendableAnvilsForge.java b/Forge/src/main/java/einstein/mendable_anvils/MendableAnvilsForge.java
index ac1181c..45b9757 100644
--- a/Forge/src/main/java/einstein/mendable_anvils/MendableAnvilsForge.java
+++ b/Forge/src/main/java/einstein/mendable_anvils/MendableAnvilsForge.java
@@ -1,7 +1,9 @@
 package einstein.mendable_anvils;
 
 import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.OnDatapackSyncEvent;
 import net.minecraftforge.event.entity.player.PlayerInteractEvent;
+import net.minecraftforge.event.server.ServerStartedEvent;
 import net.minecraftforge.fml.common.Mod;
 
 @Mod(MendableAnvilsCommon.MOD_ID)
@@ -10,6 +12,8 @@ public class MendableAnvilsForge {
     public MendableAnvilsForge() {
         MendableAnvilsCommon.init();
         MinecraftForge.EVENT_BUS.addListener(this::onBlockClick);
+        MinecraftForge.EVENT_BUS.addListener((ServerStartedEvent event) -> MendableAnvilsCommon.onDatapackSync());
+        MinecraftForge.EVENT_BUS.addListener((OnDatapackSyncEvent event) -> MendableAnvilsCommon.onDatapackSync());
     }
 
     private void onBlockClick(PlayerInteractEvent.RightClickBlock event) {