diff --git a/CHANGELOG.md b/CHANGELOG.md
index 01cd85f..fc28d57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning].
 - fixed recipe viewer integration endpoints for Fabric
 - fixed unnecessary memory usage for debug handler
 - fixed Mekanism recipe unifier using wrong recipe keys
+- fixed EnderIO Sag Mill recipe output unification causing serialization failures
 
 ## [1.1.0] - 2024-09-27
 
diff --git a/Common/src/main/java/com/almostreliable/unified/api/constant/ModConstants.java b/Common/src/main/java/com/almostreliable/unified/api/constant/ModConstants.java
index 23fd8df..3fbe33c 100644
--- a/Common/src/main/java/com/almostreliable/unified/api/constant/ModConstants.java
+++ b/Common/src/main/java/com/almostreliable/unified/api/constant/ModConstants.java
@@ -19,6 +19,7 @@ public interface ModConstants {
     String ARS_NOUVEAU = "ars_nouveau";
     String ARS_SCALAES = "ars_scalaes";
     String CYCLIC = "cyclic";
+    String ENDER_IO = "enderio";
     String GREGTECH_MODERN = "gtceu";
     String IMMERSIVE_ENGINEERING = "immersiveengineering";
     String INTEGRATED_DYNAMICS = "integrateddynamics";
diff --git a/NeoForge/src/main/java/com/almostreliable/unified/compat/unification/EnderIORecipeUnifier.java b/NeoForge/src/main/java/com/almostreliable/unified/compat/unification/EnderIORecipeUnifier.java
new file mode 100644
index 0000000..915b488
--- /dev/null
+++ b/NeoForge/src/main/java/com/almostreliable/unified/compat/unification/EnderIORecipeUnifier.java
@@ -0,0 +1,48 @@
+package com.almostreliable.unified.compat.unification;
+
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.tags.TagKey;
+
+import com.almostreliable.unified.api.constant.RecipeConstants;
+import com.almostreliable.unified.api.unification.bundled.GenericRecipeUnifier;
+import com.almostreliable.unified.api.unification.recipe.RecipeJson;
+import com.almostreliable.unified.api.unification.recipe.RecipeUnifier;
+import com.almostreliable.unified.api.unification.recipe.UnificationHelper;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+
+public class EnderIORecipeUnifier implements RecipeUnifier {
+
+    @Override
+    public void unify(UnificationHelper helper, RecipeJson recipe) {
+        GenericRecipeUnifier.INSTANCE.unifyInputs(helper, recipe);
+
+        if (!(recipe.getProperty(RecipeConstants.OUTPUTS) instanceof JsonArray outputArray)) {
+            return;
+        }
+
+        for (JsonElement outputElement : outputArray) {
+            if (!(outputElement instanceof JsonObject outputObject)) {
+                continue;
+            }
+
+            if (!(outputObject.get(RecipeConstants.ITEM) instanceof JsonObject itemObject)) {
+                continue;
+            }
+
+            if (itemObject.has(RecipeConstants.ID)) {
+                helper.unifyOutputItem(itemObject);
+                continue;
+            }
+
+            if (itemObject.get(RecipeConstants.TAG) instanceof JsonPrimitive tagPrimitive) {
+                var tag = TagKey.create(Registries.ITEM, ResourceLocation.parse(tagPrimitive.getAsString()));
+                helper.handleTagToItemReplacement(itemObject, RecipeConstants.ID, tag);
+            }
+        }
+    }
+}
diff --git a/NeoForge/src/main/java/com/almostreliable/unified/core/NeoForgePlugin.java b/NeoForge/src/main/java/com/almostreliable/unified/core/NeoForgePlugin.java
index 560f769..1e98551 100644
--- a/NeoForge/src/main/java/com/almostreliable/unified/core/NeoForgePlugin.java
+++ b/NeoForge/src/main/java/com/almostreliable/unified/core/NeoForgePlugin.java
@@ -11,6 +11,7 @@ import com.almostreliable.unified.api.unification.recipe.RecipeUnifierRegistry;
 import com.almostreliable.unified.compat.unification.ArsNouveauRecipeUnifier;
 import com.almostreliable.unified.compat.unification.CompoundIngredientUnifier;
 import com.almostreliable.unified.compat.unification.CyclicRecipeUnifier;
+import com.almostreliable.unified.compat.unification.EnderIORecipeUnifier;
 import com.almostreliable.unified.compat.unification.ImmersiveEngineeringRecipeUnifier;
 import com.almostreliable.unified.compat.unification.IntegratedDynamicsRecipeUnifier;
 import com.almostreliable.unified.compat.unification.MekanismRecipeUnifier;
@@ -39,6 +40,10 @@ public class NeoForgePlugin implements AlmostUnifiedPlugin {
             ModConstants.ARS_SCALAES
         ).forEach(modId -> registry.registerForModId(modId, new ArsNouveauRecipeUnifier()));
         registry.registerForModId(ModConstants.CYCLIC, new CyclicRecipeUnifier());
+        registry.registerForRecipeType(
+            ResourceLocation.fromNamespaceAndPath(ModConstants.ENDER_IO, "sag_milling"),
+            new EnderIORecipeUnifier()
+        );
         registry.registerForModId(ModConstants.IMMERSIVE_ENGINEERING, new ImmersiveEngineeringRecipeUnifier());
         registry.registerForModId(ModConstants.INTEGRATED_DYNAMICS, new IntegratedDynamicsRecipeUnifier());
         registry.registerForModId(ModConstants.MEKANISM, new MekanismRecipeUnifier());