diff --git a/tests/async_builder.rs b/tests/async_builder.rs
index bead9d38..b91a1a3b 100644
--- a/tests/async_builder.rs
+++ b/tests/async_builder.rs
@@ -31,7 +31,7 @@ impl AsyncSource for AsyncFile {
 
         self.format
             .parse(Some(&self.path), &text)
-            .map_err(|e| ConfigError::Foreign(e))
+            .map_err(ConfigError::Foreign)
     }
 }