diff --git a/src/sender.rs b/src/sender.rs
index 5ec4f36..c3815e0 100644
--- a/src/sender.rs
+++ b/src/sender.rs
@@ -11,7 +11,8 @@ async fn send_async(s: String) -> String {
 	let res = client
 		.post(&format!(
 			"{}/aliens/send?apiKey={}",
-			env::var("ICFPC_API_HOST").unwrap_or("https://icfpc2020-api.testkontur.ru"),
+			env::var("ICFPC_API_HOST").unwrap_or(
+				"https://icfpc2020-api.testkontur.ru".to_owned()),
 			env::var("ICFPC_API_KEY").expect("ICFPC_API_KEY must be specified")
 		))
 		.body(s.clone())