diff --git a/drink-water/script.js b/drink-water/script.js
index c96d09d..2bae482 100644
--- a/drink-water/script.js
+++ b/drink-water/script.js
@@ -11,7 +11,7 @@ smallCups.forEach((cup, idx) => {
 
 function highlightCups(idx) {
     if (idx===7 && smallCups[idx].classList.contains("full")) idx--;
-    if(smallCups[idx].classList.contains('full') && !smallCups[idx].nextElementSibling.classList.contains('full')) {
+    else if(smallCups[idx].classList.contains('full') && !smallCups[idx].nextElementSibling.classList.contains('full')) {
         idx--
     }
 
@@ -46,4 +46,4 @@ function updateBigCup() {
         remained.style.visibility = 'visible'
         listers.innerText = `${2 - (250 * fullCups / 1000)}L`
     }
-}
\ No newline at end of file
+}