diff --git a/swing/src/net/sf/openrocket/startup/jij/JarInJarStarter.java b/swing/src/net/sf/openrocket/startup/jij/JarInJarStarter.java
index 2828811ac..00a9e3384 100644
--- a/swing/src/net/sf/openrocket/startup/jij/JarInJarStarter.java
+++ b/swing/src/net/sf/openrocket/startup/jij/JarInJarStarter.java
@@ -30,7 +30,7 @@ public class JarInJarStarter {
 		}
 		
 		URL[] urlArray = urls.toArray(new URL[0]);
-		ClassLoader loader = new URLClassLoader(urlArray, null);
+		ClassLoader loader = new URLClassLoader(urlArray);
 		try {
 			Thread.currentThread().setContextClassLoader(loader);
 			Class<?> c = Class.forName(mainClass, true, loader);