diff --git a/47_Hi-Lo/javascript/hi-lo.js b/47_Hi-Lo/javascript/hi-lo.js
index 362e40a3..6964570d 100644
--- a/47_Hi-Lo/javascript/hi-lo.js
+++ b/47_Hi-Lo/javascript/hi-lo.js
@@ -86,6 +86,7 @@ async function main()
         print("\n");
         print("PLAY AGAIN (YES OR NO)");
         str = await input();
+        str = str.toUpperCase();
         if (str != "YES")
             break;
     }