diff --git a/indexer/src/main/java/com/metamx/druid/indexer/HadoopDruidIndexerConfig.java b/indexer/src/main/java/com/metamx/druid/indexer/HadoopDruidIndexerConfig.java
index a6d7a878ae1..c246600e8a8 100644
--- a/indexer/src/main/java/com/metamx/druid/indexer/HadoopDruidIndexerConfig.java
+++ b/indexer/src/main/java/com/metamx/druid/indexer/HadoopDruidIndexerConfig.java
@@ -106,6 +106,7 @@ public class HadoopDruidIndexerConfig
       );
       for (Registererer registererer : registererers) {
         registererer.register();
+        registererer.registerSubType(jsonMapper);
       }
     }