diff --git a/include/persistent_data.hpp b/include/persistent_data.hpp
index afcdb14..0cdedcd 100644
--- a/include/persistent_data.hpp
+++ b/include/persistent_data.hpp
@@ -326,6 +326,9 @@
             subscription["Id"] = subValue.id;
             subscription["Context"] = subValue.customText;
             subscription["DeliveryRetryPolicy"] = subValue.retryPolicy;
+            subscription["SendHeartbeat"] = subValue.sendHeartbeat;
+            subscription["HeartbeatIntervalMinutes"] =
+                subValue.hbIntervalMinutes;
             subscription["Destination"] = subValue.destinationUrl;
             subscription["EventFormatType"] = subValue.eventFormatType;
             subscription["HttpHeaders"] = std::move(headers);