diff --git a/src/main/java/hudson/plugins/ec2/Tenancy.java b/src/main/java/hudson/plugins/ec2/Tenancy.java
index bed6372cb..15e7ddf53 100644
--- a/src/main/java/hudson/plugins/ec2/Tenancy.java
+++ b/src/main/java/hudson/plugins/ec2/Tenancy.java
@@ -5,7 +5,7 @@ public enum Tenancy {
     Dedicated("dedicated"),
     Host("host");
 
-    private String value;
+    private final String value;
 
     private Tenancy(String value) {
         this.value = value;