diff --git a/bundles/org.eclipse.osgi/container/src/org/eclipse/osgi/internal/url/MultiplexingFactory.java b/bundles/org.eclipse.osgi/container/src/org/eclipse/osgi/internal/url/MultiplexingFactory.java
index e2226b7..402375f 100644
--- a/bundles/org.eclipse.osgi/container/src/org/eclipse/osgi/internal/url/MultiplexingFactory.java
+++ b/bundles/org.eclipse.osgi/container/src/org/eclipse/osgi/internal/url/MultiplexingFactory.java
@@ -232,7 +232,12 @@
 
 	private boolean isSystemClass(final Class<?> clazz) {
 		// we want to ignore classes from the system
-		ClassLoader cl = AccessController.doPrivileged((PrivilegedAction<ClassLoader>) clazz::getClassLoader);
+		ClassLoader cl = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
+			@Override
+			public ClassLoader run() {
+				return clazz.getClassLoader();
+			}
+		});
 		return cl == null || systemLoaders.contains(cl);
 	}