diff --git a/web/frontend/src/components/AttemptList.vue b/web/frontend/src/components/AttemptList.vue
index a0f21a2..6a32655 100644
--- a/web/frontend/src/components/AttemptList.vue
+++ b/web/frontend/src/components/AttemptList.vue
@@ -12,9 +12,10 @@ import { Component, Prop, Vue } from 'vue-property-decorator';
 import { BvTableFieldArray, BvTableFormatterCallback } from 'bootstrap-vue';
 import { LoginAttempt } from '@/apiary/apiary';
 
-const timeFormatter: BvTableFormatterCallback = (value: string) => {
+const timeFormatter: BvTableFormatterCallback = (value: string): string => {
   const d = new Date(value);
-  return `${d.getUTCHours}:${d.getUTCMinutes}:${d.getUTCSeconds}`;
+  const s = `${d.getUTCHours}:${d.getUTCMinutes}:${d.getUTCSeconds}`;
+  return s;
 };
 
 @Component