diff --git a/jdk/src/jdk.management/share/classes/com/sun/management/internal/DiagnosticCommandImpl.java b/jdk/src/jdk.management/share/classes/com/sun/management/internal/DiagnosticCommandImpl.java
index a0718a3c2f3..5e149633dcd 100644
--- a/jdk/src/jdk.management/share/classes/com/sun/management/internal/DiagnosticCommandImpl.java
+++ b/jdk/src/jdk.management/share/classes/com/sun/management/internal/DiagnosticCommandImpl.java
@@ -343,7 +343,7 @@ public class DiagnosticCommandImpl extends NotificationEmitterSupport
                                                    "Diagnostic Framework Notification");
             }
         }
-        return notifInfo;
+        return notifInfo.clone();
     }
 
     private static long seqNumber = 0;