diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/extension/ExtensionAdapter.java b/src/main/org/apache/tools/ant/taskdefs/optional/extension/ExtensionAdapter.java
index fb4c615ed..a6ff6d203 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/extension/ExtensionAdapter.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/extension/ExtensionAdapter.java
@@ -276,6 +276,6 @@ public class ExtensionAdapter
 
     public String toString()
     {
-        return toExtension().toString();
+        return "{" + toExtension().toString() + "}";
     }
 }