diff --git a/crates/app/src/config/config_file.rs b/crates/app/src/config/config_file.rs
index aaf92d1..15f660c 100644
--- a/crates/app/src/config/config_file.rs
+++ b/crates/app/src/config/config_file.rs
@@ -47,7 +47,7 @@ impl Configs {
         {
             Some("ron") => Ok(serde_json::from_str(&fs::read_to_string(p)?)?),
             Some("json") => Ok(ron::from_str(&fs::read_to_string(p)?)?),
-            e => Err(Config::UnknownExtension(e.map(str::to_string))),
+            e => Err(Config::UnknownExtension(e.map(str::to_owned))),
         }
     }
 }