diff --git a/src/main/kotlin/org/opensearch/replication/task/index/IndexReplicationParams.kt b/src/main/kotlin/org/opensearch/replication/task/index/IndexReplicationParams.kt
index 0452bc24..0c4f4a53 100644
--- a/src/main/kotlin/org/opensearch/replication/task/index/IndexReplicationParams.kt
+++ b/src/main/kotlin/org/opensearch/replication/task/index/IndexReplicationParams.kt
@@ -20,6 +20,7 @@ import org.opensearch.common.xcontent.ObjectParser
 import org.opensearch.common.xcontent.ToXContent
 import org.opensearch.common.xcontent.XContentBuilder
 import org.opensearch.common.xcontent.XContentParser
+import org.opensearch.common.xcontent.XContentType
 import org.opensearch.index.Index
 import org.opensearch.persistent.PersistentTaskParams
 import java.io.IOException
@@ -80,6 +81,6 @@ class IndexReplicationParams : PersistentTaskParams {
     }
 
     override fun toString(): String {
-        return Strings.toString(this)
+        return Strings.toString(XContentType.JSON, this)
     }
 }
diff --git a/src/main/kotlin/org/opensearch/replication/task/shard/ShardReplicationParams.kt b/src/main/kotlin/org/opensearch/replication/task/shard/ShardReplicationParams.kt
index 12432eae..eb5c23b1 100644
--- a/src/main/kotlin/org/opensearch/replication/task/shard/ShardReplicationParams.kt
+++ b/src/main/kotlin/org/opensearch/replication/task/shard/ShardReplicationParams.kt
@@ -20,6 +20,7 @@ import org.opensearch.common.xcontent.ObjectParser
 import org.opensearch.common.xcontent.ToXContent
 import org.opensearch.common.xcontent.XContentBuilder
 import org.opensearch.common.xcontent.XContentParser
+import org.opensearch.common.xcontent.XContentType
 import org.opensearch.index.shard.ShardId
 import org.opensearch.persistent.PersistentTaskParams
 import java.io.IOException
@@ -84,7 +85,7 @@ class ShardReplicationParams : PersistentTaskParams {
     }
 
     override fun toString(): String {
-        return Strings.toString(this)
+        return Strings.toString(XContentType.JSON, this)
     }
 
     class Builder {
@@ -122,4 +123,4 @@ class ShardReplicationParams : PersistentTaskParams {
                     followerShardIdObj.id))
         }
     }
-}
\ No newline at end of file
+}