diff --git a/heka/files/encoder/es-json.toml b/heka/files/encoder/es-json.toml
index 0674216..68ceecf 100644
--- a/heka/files/encoder/es-json.toml
+++ b/heka/files/encoder/es-json.toml
@@ -1,4 +1,4 @@
-[es-json]
+[es_json]
 type = "ESJsonEncoder"
 index = "{{ values.index }}"