diff --git a/sql/src/main/java/org/apache/druid/sql/calcite/run/DruidHook.java b/sql/src/main/java/org/apache/druid/sql/calcite/run/DruidHook.java
index 1a1f8e09bfe..99aa44da0a3 100644
--- a/sql/src/main/java/org/apache/druid/sql/calcite/run/DruidHook.java
+++ b/sql/src/main/java/org/apache/druid/sql/calcite/run/DruidHook.java
@@ -65,10 +65,10 @@ public interface DruidHook<T>
 
   }
 
-  final HookKey<RelNode> CONVERTED_PLAN = new HookKey<>("converted", RelNode.class);
-  final HookKey<RelNode> LOGICAL_PLAN = new HookKey<>("logicalPlan", RelNode.class);
-  final HookKey<RelNode> DRUID_PLAN = new HookKey<>("druidPlan", RelNode.class);
-  final HookKey<String> SQL = new HookKey<>("sql", String.class);
+  HookKey<RelNode> CONVERTED_PLAN = new HookKey<>("converted", RelNode.class);
+  HookKey<RelNode> LOGICAL_PLAN = new HookKey<>("logicalPlan", RelNode.class);
+  HookKey<RelNode> DRUID_PLAN = new HookKey<>("druidPlan", RelNode.class);
+  HookKey<String> SQL = new HookKey<>("sql", String.class);
 
   void invoke(HookKey<T> key, T object);