diff --git a/common/src/main/java/com/viaversion/viaversion/rewriter/RegistryDataRewriter.java b/common/src/main/java/com/viaversion/viaversion/rewriter/RegistryDataRewriter.java
index 0e8ad5482..a364b349a 100644
--- a/common/src/main/java/com/viaversion/viaversion/rewriter/RegistryDataRewriter.java
+++ b/common/src/main/java/com/viaversion/viaversion/rewriter/RegistryDataRewriter.java
@@ -59,6 +59,8 @@ public class RegistryDataRewriter {
         key = Key.stripMinecraftNamespace(key);
         if (key.equals("enchantment")) {
             updateEnchantments(entries);
+        } else if (key.equals("trim_material")) {
+            updateTrimMaterials(entries);
         }
 
         final List<RegistryEntry> toAdd = this.toAdd.get(key);
@@ -126,6 +128,22 @@ public class RegistryDataRewriter {
         }
     }
 
+    public void updateTrimMaterials(final RegistryEntry[] entries) {
+        if (protocol.getMappingData().getFullItemMappings() == null) {
+            return;
+        }
+
+        for (final RegistryEntry entry : entries) {
+            if (entry.tag() == null) {
+                continue;
+            }
+
+            final StringTag ingredientTag = ((CompoundTag) entry.tag()).getStringTag("ingredient");
+            final String mappedIngredient = protocol.getMappingData().getFullItemMappings().mappedIdentifier(ingredientTag.getValue());
+            ingredientTag.setValue(mappedIngredient);
+        }
+    }
+
     private void updateNestedEffect(final CompoundTag effectsTag) {
         final CompoundTag effect = effectsTag.getCompoundTag("effect");
         if (effect == null) {