diff --git a/src/components/DurationInput.vue b/src/components/DurationInput.vue
index f8a3972..6cae191 100644
--- a/src/components/DurationInput.vue
+++ b/src/components/DurationInput.vue
@@ -295,7 +295,7 @@ function handleArrowDown(newVal, tUnit) {
 function incrementPreviousUnit(input) {
   if (input.dataset.index > 0) {
     const prevUnit = document.querySelector(
-      `input[data-index="${parseInt(input.dataset.index) - 1}"]`,
+      `input[data-index="${parseInt(input.dataset.index, 10) - 1}"]`,
     );
     if (prevUnit) actionUpDown(prevUnit, true);
   }
@@ -325,7 +325,7 @@ function updateInputValue(input, newVal, tUnit) {
  * @param {string} [size] - 'max' or 'min' to set boundary days.
  */
 function secondToDate(totalSec, size) {
-  totalSec = parseInt(totalSec);
+  totalSec = parseInt(totalSec, 10);
   if (!isNaN(totalSec)) {
     seconds.value = totalSec % 60;
     minutes.value = (Math.floor(totalSec - seconds.value) / 60) % 60;