diff --git a/src/components/JMultipleDatePicker.vue b/src/components/JMultipleDatePicker.vue
index 4aaeb71..7a26c80 100644
--- a/src/components/JMultipleDatePicker.vue
+++ b/src/components/JMultipleDatePicker.vue
@@ -101,7 +101,7 @@ export default {
         const oldVal = this.checkedValue.join(',')
         if (newVal !== oldVal) {
           if (newVal) {
-            this.checkedValue = newVal.split(',')
+            this.checkedValue = [...new Set(newVal.split(','))]
           } else {
             this.checkedValue = []
           }