diff --git a/serde/src/private/ser.rs b/serde/src/private/ser.rs
index a73f259b..12259894 100644
--- a/serde/src/private/ser.rs
+++ b/serde/src/private/ser.rs
@@ -1275,7 +1275,7 @@ where
 {
     fn new(map: &'a mut M) -> Self {
         FlatMapSerializeTupleVariantAsMapValue {
-            map: map,
+            map,
             fields: Vec::new(),
         }
     }