diff --git a/base_1.md b/base_1.md
index e70433d2bbe0e86d01b2faa58a11b5cdc2c4349f..24c4d8da6d2d5861fb73c98c8bb7ebc59050bd2d 100644
--- a/base_1.md
+++ b/base_1.md
@@ -64,7 +64,7 @@ int main() {
 - Il existe une multitude d'options de compilation:
 
     ```bash
-    $ clang -O -std=c11 -Wall -Wextra -g porg.c -o prog 
+    $ clang -O1 -std=c11 -Wall -Wextra -g porg.c -o prog 
     -fsanitize=address -fsanitize=leak -fsanitize=undefined
     ```
     1. `-std=c11` utilisation de C11.