diff --git a/slides/boucles_conditions.md b/slides/boucles_conditions.md
index 01f7146688e02e4cab225ea249158c4cbfd22a44..6eb6f32e8789a3c388a3c1a4308d1c715f7d8ad6 100644
--- a/slides/boucles_conditions.md
+++ b/slides/boucles_conditions.md
@@ -17,7 +17,7 @@ int main() {
   int n = 0;
   scanf("%d", &n);
   int res = 0;
-  for (int i = 0; i <= n; ++i) {
+  for (int i = 1; i <= n; ++i) {
     res += i;
   }
   printf("For = %d, the result is %d\n", n, res);