diff --git a/core/src/main/java/hudson/model/Run.java b/core/src/main/java/hudson/model/Run.java
index 2888029dd25c71346b65718ee26e4755c4bc210a..84ddb45ecb7c2215bf19199f706c18fc389d12ae 100644
--- a/core/src/main/java/hudson/model/Run.java
+++ b/core/src/main/java/hudson/model/Run.java
@@ -744,6 +744,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
         // marked to be preserved, or if the build should not be deleted
         // due to dependencies!
         if (isKeepLog()) {
+            sendError(toString()+" is explicitly marked to be preserved",req,rsp);
             return;
         }