diff --git a/src/main/java/hudson/plugins/copyartifact/monitor/LegacyJobConfigMigrationMonitor.java b/src/main/java/hudson/plugins/copyartifact/monitor/LegacyJobConfigMigrationMonitor.java
index 1275113f..a98f7ce3 100644
--- a/src/main/java/hudson/plugins/copyartifact/monitor/LegacyJobConfigMigrationMonitor.java
+++ b/src/main/java/hudson/plugins/copyartifact/monitor/LegacyJobConfigMigrationMonitor.java
@@ -125,6 +125,7 @@ public boolean isActivated() {
     /**
      * @return data holding the list of jobs to warn.
      */
+    @Restricted(NoExternalUse.class)
     /* Visible for testing */ LegacyMonitorData getData() {
         return data;
     }