diff --git a/src/share/classes/sun/management/DiagnosticCommandImpl.java b/src/share/classes/sun/management/DiagnosticCommandImpl.java
index eeeee9af053e75674dfd9ec75b73c98ee08e1622..faae805d48feabf39dbad3a9e0e4822b2a8021b8 100644
--- a/src/share/classes/sun/management/DiagnosticCommandImpl.java
+++ b/src/share/classes/sun/management/DiagnosticCommandImpl.java
@@ -312,7 +312,7 @@ class DiagnosticCommandImpl extends NotificationEmitterSupport
                                                    "Diagnostic Framework Notification");
             }
         }
-        return notifInfo;
+        return notifInfo.clone();
     }
 
     private static long seqNumber = 0;