diff --git a/src/components/wt-select/mixins/multiselectMixin.js b/src/components/wt-select/mixins/multiselectMixin.js
index 29373bf5..941ffc69 100644
--- a/src/components/wt-select/mixins/multiselectMixin.js
+++ b/src/components/wt-select/mixins/multiselectMixin.js
@@ -178,7 +178,7 @@ export default {
       handler() {
         if (this.trackBy === null) return; // then, options are primitives
 
-        for (const opt of options) {
+        for (const opt of this.options) {
           this.cachedOptionsMap[opt[this.useValueFromOptionsByProp || this.trackBy]] = opt;
         }
       },