diff --git a/src/main/java/cpw/mods/modlauncher/ModuleLayerHandler.java b/src/main/java/cpw/mods/modlauncher/ModuleLayerHandler.java
index a83f33a..2275877 100644
--- a/src/main/java/cpw/mods/modlauncher/ModuleLayerHandler.java
+++ b/src/main/java/cpw/mods/modlauncher/ModuleLayerHandler.java
@@ -23,6 +23,7 @@
 import cpw.mods.jarhandling.SecureJar;
 import cpw.mods.modlauncher.api.IModuleLayerManager;
 import cpw.mods.modlauncher.api.NamedPath;
+import org.jetbrains.annotations.Nullable;
 
 import java.lang.module.Configuration;
 import java.lang.module.ModuleFinder;
@@ -49,11 +50,15 @@ SecureJar build() {
     private final EnumMap<Layer, LayerInfo> completedLayers = new EnumMap<>(Layer.class);
 
     public ModuleLayerHandler() {
+        this(null);
+    }
+
+    public ModuleLayerHandler(@Nullable ClassLoader parentLoader) {
         ClassLoader classLoader = getClass().getClassLoader();
         // Create a new ModuleClassLoader from the boot module layer if it doesn't exist already.
         // This allows us to launch without BootstrapLauncher.
         ModuleClassLoader cl = classLoader instanceof ModuleClassLoader moduleCl ? moduleCl
-            : new ModuleClassLoader("BOOT", ModuleLayer.boot().configuration(), List.of());
+            : new ModuleClassLoader("BOOT", ModuleLayer.boot().configuration(), List.of(), parentLoader);
         var ownLayer = Objects.requireNonNullElse(getClass().getModule().getLayer(), ModuleLayer.boot());
         completedLayers.put(Layer.BOOT, new LayerInfo(ownLayer, cl));
     }