diff --git a/sea_battle_backend/src/data/end_game_map.rs b/sea_battle_backend/src/data/end_game_map.rs
index 4d9dc0d..b0f9e45 100644
--- a/sea_battle_backend/src/data/end_game_map.rs
+++ b/sea_battle_backend/src/data/end_game_map.rs
@@ -1,3 +1,5 @@
+use std::fmt::Write;
+
 use crate::data::{BoatsLayout, MapCellContent};
 
 #[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
@@ -11,7 +13,7 @@ impl EndGameMap {
         let mut s = String::new();
         for row in &self.grid {
             for col in row {
-                s.push_str(&format!("{} ", col.letter()));
+                write!(&mut s, "{} ", col.letter()).unwrap();
             }
             s.push('\n');
         }