diff --git a/ui/scripts/system.js b/ui/scripts/system.js
index d5ea795187f..0d4e5a90c8c 100644
--- a/ui/scripts/system.js
+++ b/ui/scripts/system.js
@@ -5536,10 +5536,8 @@
                   var array1 = [];
                   array1.push("&hosttags=" + todb(args.data.hosttags));
 
-                  if (args.data.oscategoryid != null)
+                  if (args.data.oscategoryid != null && args.data.oscategoryid != 'None')
                     array1.push("&osCategoryId=" + args.data.oscategoryid);
-                  else //OS is none
-                    array1.push("&osCategoryId=0");
 
                   $.ajax({
                     url: createURL("updateHost&id=" + args.context.hosts[0].id + array1.join("")),
@@ -5740,7 +5738,9 @@
                           async: true,
                           success: function(json) {
                             var oscategoryObjs = json.listoscategoriesresponse.oscategory;
-                            var items = [];
+                            var items = [
+                              { id: null, description: _l('label.none') }
+                            ];
                             $(oscategoryObjs).each(function() {
                               items.push({id: this.id, description: this.name});
                             });