diff --git a/src/config.rs b/src/config.rs
index a2c7301..887235c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -88,7 +88,7 @@ where
         where
             E: Error,
         {
-            Ok(format!("{}", v))
+            Ok(format!("{v}"))
         }
 
         fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>