diff --git a/src/jmap/map.js b/src/jmap/map.js
index ecb84aa2e..d7c95a8b3 100644
--- a/src/jmap/map.js
+++ b/src/jmap/map.js
@@ -191,7 +191,7 @@ class Jlmap {
 
         for (var prop in elem) {
             if (oDevice[prop] != elem[prop]) {
-                oDevice[prop] = elem[prop];
+                deepAssign(oDevice, elem);
                 return true;
             }
         }