diff --git a/slides/cours_11.md b/slides/cours_11.md
index 63be99a02861c4f63cffedc3ed2dbb79dfd92213..322f83255718da3edec348877c98764bccaa89da 100644
--- a/slides/cours_11.md
+++ b/slides/cours_11.md
@@ -165,7 +165,7 @@ void stack_push(stack *s, int val) {
     element *elem = malloc(sizeof(*elem));
     elem->data = val;
     elem->next = *s;
-    s = elem;
+    *s = elem;
 }
 ```