diff --git a/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java b/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
index 934fd30..d00884c 100644
--- a/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
+++ b/framework/src/main/java/org/apache/felix/framework/ExtensionManager.java
@@ -646,7 +646,7 @@
         {
             if (!m_exportNames.contains(Util.getClassPackage(name)))
             {
-                return null;
+                throw new ClassNotFoundException(name);
             }
 
             return getClass().getClassLoader().loadClass(name);