diff --git a/core/src/main/java/hudson/model/Actionable.java b/core/src/main/java/hudson/model/Actionable.java
index f5c5a9fc06319d9de58c9754e6a15e19b19821cb..8009d4d7f63b201d309f62cdb6cd48004526f5e9 100644
--- a/core/src/main/java/hudson/model/Actionable.java
+++ b/core/src/main/java/hudson/model/Actionable.java
@@ -19,7 +19,7 @@ public abstract class Actionable extends AbstractModelObject {
     /**
      * Actions contributed to this model object.
      */
-    private List<Action> actions;
+    private volatile List<Action> actions;
 
     /**
      * Gets actions contributed to this build.