diff --git a/src/components/accordiontab/AccordionTab.d.ts b/src/components/accordiontab/AccordionTab.d.ts
index 47ec72cfb..cca5c2059 100644
--- a/src/components/accordiontab/AccordionTab.d.ts
+++ b/src/components/accordiontab/AccordionTab.d.ts
@@ -1,9 +1,9 @@
 import Vue, { VNode } from 'vue';
 
 export declare class AccordionTab extends Vue {
-    header: string;
-    active: boolean;
-    disabled: boolean;
+    header?: string;
+    active?: boolean;
+    disabled?: boolean;
     $slot: {
         '': VNode[];
         'header': VNode[];