diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index 2ef623f..f7c7ffb 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -16,7 +16,7 @@ macro_rules! do_if_enabled {
         }
 
         #[cfg(not(feature = $feature))]
-        panic!(format!("feature \"{}\" is not enabled", $feature))
+        panic!("feature \"{}\" is not enabled", $feature)
     }};
 }