diff --git a/core/src/main/java/hudson/model/Slave.java b/core/src/main/java/hudson/model/Slave.java
index 982b77bbe5ed652327f0b35eea82e8dbce3ac5b4..0285c348666953b09cabe149feb2a4d77cfa0407 100644
--- a/core/src/main/java/hudson/model/Slave.java
+++ b/core/src/main/java/hudson/model/Slave.java
@@ -151,11 +151,6 @@ public abstract class Slave extends Node implements Serializable {
     private /*almost final*/ DescribableList<NodeProperty<?>,NodePropertyDescriptor> nodeProperties =
             new DescribableList<>(this);
 
-    /**
-     * Lazily computed set of labels from {@link #label}.
-     */
-    private transient volatile Set<Label> labels;
-
     /**
      * Removed with no replacement.
      */