diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java
index adbabb4a9e..5c0c9763cc 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/downlink/DefaultLwM2mDownlinkMsgHandler.java
@@ -469,7 +469,7 @@ public class DefaultLwM2mDownlinkMsgHandler extends LwM2MExecutorAwareService im
                 versionedId = ((TbLwM2MObserveRequest) request).getVersionedId();
             }
             String id = fromVersionedIdToObjectId(versionedId);
-            if (id != null && !client.isResourceMultiInstances(versionedId, modelProvider)) {
+            if (id != null && new LwM2mPath(id).isResource() && !client.isResourceMultiInstances(versionedId, modelProvider)) {
                 return client.getDefaultContentFormat();
             }
             else {