diff --git a/src/main/kotlin/org/opensearch/commons/alerting/model/Alert.kt b/src/main/kotlin/org/opensearch/commons/alerting/model/Alert.kt
index 3dcd97bf..7da58a14 100644
--- a/src/main/kotlin/org/opensearch/commons/alerting/model/Alert.kt
+++ b/src/main/kotlin/org/opensearch/commons/alerting/model/Alert.kt
@@ -312,7 +312,8 @@ data class Alert(
         actionExecutionResults = sin.readList(::ActionExecutionResult),
         aggregationResultBucket = if (sin.readBoolean()) AggregationResultBucket(sin) else null,
         executionId = sin.readOptionalString(),
-        associatedAlertIds = sin.readStringList()
+        associatedAlertIds = sin.readStringList(),
+        clusters = sin.readOptionalStringList()
     )
 
     fun isAcknowledged(): Boolean = (state == State.ACKNOWLEDGED)