diff --git a/src/share/classes/javax/swing/UIDefaults.java b/src/share/classes/javax/swing/UIDefaults.java
index 9f22122d7b28d07056f7323cd9f297ca0f2e6286..9f304e742c76e4e3ad92c4948374d924fcc12faa 100644
--- a/src/share/classes/javax/swing/UIDefaults.java
+++ b/src/share/classes/javax/swing/UIDefaults.java
@@ -677,6 +677,8 @@ public class UIDefaults extends Hashtable<Object,Object>
         try {
             String className = (String)get(uiClassID);
             if (className != null) {
+                ReflectUtil.checkPackageAccess(className);
+
                 Class cls = (Class)get(className);
                 if (cls == null) {
                     if (uiClassLoader == null) {