diff --git a/src/main/java/net/minecraftforge/fml/relauncher/FMLLaunchHandler.java b/src/main/java/net/minecraftforge/fml/relauncher/FMLLaunchHandler.java
index 0ea04a64e..0f7b2c29f 100644
--- a/src/main/java/net/minecraftforge/fml/relauncher/FMLLaunchHandler.java
+++ b/src/main/java/net/minecraftforge/fml/relauncher/FMLLaunchHandler.java
@@ -64,6 +64,7 @@ private FMLLaunchHandler(LaunchClassLoader launchLoader, FMLTweaker tweaker)
         this.classLoader = launchLoader;
         this.tweaker = tweaker;
         this.minecraftHome = tweaker.getGameDir();
+        this.classLoader.addTransformerExclusion("com.cleanroommc.loader.");
         this.classLoader.addClassLoaderExclusion("net.minecraftforge.fml.relauncher.");
         this.classLoader.addClassLoaderExclusion("net.minecraftforge.classloading.");
         this.classLoader.addTransformerExclusion("net.minecraftforge.fml.common.asm.transformers.");