diff --git a/src/main/org/apache/tools/ant/AntClassLoader.java b/src/main/org/apache/tools/ant/AntClassLoader.java
index d6ff79ccb..3aa8e9e04 100644
--- a/src/main/org/apache/tools/ant/AntClassLoader.java
+++ b/src/main/org/apache/tools/ant/AntClassLoader.java
@@ -921,7 +921,7 @@ public class AntClassLoader extends ClassLoader implements BuildListener {
                 }
             }
             
-            throw new ClassNotFoundException();
+            throw new ClassNotFoundException(name);
         }
         finally {
             try {