diff --git a/src/components/ha-attributes.html b/src/components/ha-attributes.html
index 2e665e0d92..b4dd830700 100644
--- a/src/components/ha-attributes.html
+++ b/src/components/ha-attributes.html
@@ -50,7 +50,7 @@
     },
 
     computeFiltersArray: function (extraFilters) {
-      return Object.keys(window.hassAttributeUtil.LOGIC_STATE_ATTRIBUTES) + (extraFilters ? extraFilters.split(',') : []);
+      return Object.keys(window.hassAttributeUtil.LOGIC_STATE_ATTRIBUTES).concat(extraFilters ? extraFilters.split(',') : []);
     },
 
     computeDisplayAttributes: function (stateObj, filtersArray) {