diff --git a/src/main/java/org/elasticsearch/indices/ttl/IndicesTTLService.java b/src/main/java/org/elasticsearch/indices/ttl/IndicesTTLService.java
index 85a37d86a2a..e68af6e95a6 100644
--- a/src/main/java/org/elasticsearch/indices/ttl/IndicesTTLService.java
+++ b/src/main/java/org/elasticsearch/indices/ttl/IndicesTTLService.java
@@ -65,7 +65,10 @@ public class IndicesTTLService extends AbstractLifecycleComponent<IndicesTTLServ
 
     static {
         MetaData.addDynamicSettings(
-                "indices.ttl.interval",
+                "indices.ttl.interval"
+        );
+
+        IndexMetaData.addDynamicSettings(
                 "index.ttl.disable_purge"
         );
     }