Index: src/org/python/core/BytecodeLoader2.java
===================================================================
--- src/org/python/core/BytecodeLoader2.java	(revision 2759)
+++ src/org/python/core/BytecodeLoader2.java	(working copy)
@@ -11,6 +11,11 @@
 class BytecodeLoader2 extends SecureClassLoader implements Loader {
     private Vector parents;
 
+    public BytecodeLoader2(ClassLoader parent) {
+        super(parent);
+        this.parents = BytecodeLoader.init();
+    }
+
     public BytecodeLoader2() {
         this.parents = BytecodeLoader.init();
     }
Index: src/org/python/core/BytecodeLoader.java
===================================================================
--- src/org/python/core/BytecodeLoader.java	(revision 2759)
+++ src/org/python/core/BytecodeLoader.java	(working copy)
@@ -2,6 +2,7 @@
 
 package org.python.core;
 
+import java.lang.reflect.Constructor;
 import java.util.Vector;
 
 /**
@@ -57,7 +58,15 @@
             }
         }
         try {
-            return (Loader) loaderClass.newInstance();
+            Loader loader;
+            if(Py.defaultSystemState.getClassLoader() != null){
+                Constructor loaderWithParentConstructor = loaderClass.getConstructor(new Class[]{ClassLoader.class});
+                loader = (Loader) loaderWithParentConstructor.newInstance(new Object[]{Py.defaultSystemState.getClassLoader()});
+            }else{
+               loader = (Loader) loaderClass.newInstance();
+            }
+            
+            return loader;
         } catch (Exception e) {
             return new BytecodeLoader1();
         }