diff --git a/src/angular-bootstrap-select.js b/src/angular-bootstrap-select.js
index 67d80aa..9d98d2a 100644
--- a/src/angular-bootstrap-select.js
+++ b/src/angular-bootstrap-select.js
@@ -203,6 +203,10 @@ function selectpickerDirective($parse, $timeout) {
       if (attrs.ngModel) {
         scope.$watch(attrs.ngModel, refresh, true);
       }
+      
+      if (attrs.ngOptions && / in /.test(attrs.ngOptions)) {
+        scope.$watch(attrs.ngOptions.replace('::', '').split(' in ')[1], refresh, true);
+      }
 
       if (attrs.ngDisabled) {
         scope.$watch(attrs.ngDisabled, refresh, true);