diff --git a/legacyforge/src/main/java/cpw/mods/fml/relauncher/IClassTransformer.java b/legacyforge/src/main/java/cpw/mods/fml/relauncher/IClassTransformer.java
index e39d916..78e1086 100644
--- a/legacyforge/src/main/java/cpw/mods/fml/relauncher/IClassTransformer.java
+++ b/legacyforge/src/main/java/cpw/mods/fml/relauncher/IClassTransformer.java
@@ -16,5 +16,6 @@
 
 public interface IClassTransformer
 {
-    public byte[] transform(String name, byte[] bytes);
+    public byte[] transform(String name, byte[] bytes); // 1.4
+    public byte[] transform(String name, String transformedName, byte[] bytes); // 1.5
 }
diff --git a/legacyforge/src/main/java/io/dogboy/serializationisbad/legacyforge/SIBTransformerRelauncher.java b/legacyforge/src/main/java/io/dogboy/serializationisbad/legacyforge/SIBTransformerRelauncher.java
index bf01df6..a49cd5e 100644
--- a/legacyforge/src/main/java/io/dogboy/serializationisbad/legacyforge/SIBTransformerRelauncher.java
+++ b/legacyforge/src/main/java/io/dogboy/serializationisbad/legacyforge/SIBTransformerRelauncher.java
@@ -6,8 +6,13 @@
 public class SIBTransformerRelauncher implements IClassTransformer {
     @Override
     public byte[] transform(String name, byte[] bytes) {
-        if (Patches.getPatchModuleForClass(name) == null) return bytes;
+        return this.transform(null, name, bytes);
+    }
+
+    @Override
+    public byte[] transform(String name, String transformedName, byte[] bytes) {
+        if (Patches.getPatchModuleForClass(transformedName) == null) return bytes;
 
-        return Patches.patchClass(bytes, name, false);
+        return Patches.patchClass(bytes, transformedName, false);
     }
 }
diff --git a/serializationisbad.json b/serializationisbad.json
index 0c1770d..1a0d1ac 100644
--- a/serializationisbad.json
+++ b/serializationisbad.json
@@ -256,7 +256,9 @@
                 "logisticspipes.network.packets.routingdebug.RoutingUpdateTargetResponse",
                 "logisticspipes.network.packets.GuiArgumentPacket"
             ],
-            "classAllowlist": [],
+            "classAllowlist": [
+                "I"
+            ],
             "packageAllowlist": [
                 "logisticspipes"
             ]