diff --git a/src/routes/courses/[id]/lessons/+page.svelte b/src/routes/courses/[id]/lessons/+page.svelte
index 3c86e18a..20c5286a 100644
--- a/src/routes/courses/[id]/lessons/+page.svelte
+++ b/src/routes/courses/[id]/lessons/+page.svelte
@@ -88,7 +88,7 @@
   function getLessonOrder(id) {
     const index = $lessons.findIndex((lesson) => lesson.id === id);
 
-    if (index < 10) {
+    if (index < 9) {
       return '0' + (index + 1);
     } else {
       return index + 1;