diff --git a/common/src/main/java/org/opensearch/ml/common/CommonValue.java b/common/src/main/java/org/opensearch/ml/common/CommonValue.java
index 29980003fa..34563f2394 100644
--- a/common/src/main/java/org/opensearch/ml/common/CommonValue.java
+++ b/common/src/main/java/org/opensearch/ml/common/CommonValue.java
@@ -268,7 +268,7 @@ public class CommonValue {
                         + "    },\n"
                         + "      \""
                         + MLModel.GUARDRAILS_FIELD
-                        + "\" : {\"type\": \"flat_object\"},\n"
+                        + "\" : {\"type\": \"flat_object\"}\n"
                         + "}";
 
         public static final String ML_TASK_INDEX_MAPPING = "{\n"