diff --git a/src/index.html b/src/index.html
index 8e4f2156..ce4d6f85 100644
--- a/src/index.html
+++ b/src/index.html
@@ -22,7 +22,7 @@ <h2>승객 선택</h2>
           </div>
         </div>
         <div class="spin-input-container adult-passenger-spin">
-          <button type="button" class="spin-button" data-step="-1" aria-label="성인 탑승자 한 명 줄이기">-</button>
+          <button type="button" class="spin-button" data-step="-1" aria-label="성인 탑승자 한 명 줄이기" aria-disabled="true">-</button>
           <input
             id="adult-passenger-count-input"
             class="passenger-count-input"