diff --git a/lab3/zad2/src/main.rs b/lab3/zad2/src/main.rs
index d979c42..807fec4 100644
--- a/lab3/zad2/src/main.rs
+++ b/lab3/zad2/src/main.rs
@@ -78,6 +78,7 @@ fn main() -> io::Result<()> {
 
     let mut results_file = OpenOptions::new()
         .create(true)
+        .write(true)
         .truncate(true)
         .open(format!("./results/k1"))?;