diff --git a/serde_derive/src/ser.rs b/serde_derive/src/ser.rs
index 4c1a0d6f..bbd83d66 100644
--- a/serde_derive/src/ser.rs
+++ b/serde_derive/src/ser.rs
@@ -319,8 +319,7 @@ fn serialize_struct_as_struct(
         .filter(|&field| !field.attrs.skip_serializing())
         .peekable();
 
-    let let_mut = mut_if(serialized_fields.peek().is_some() ||
-                         additional_field_count > 0);
+    let let_mut = mut_if(serialized_fields.peek().is_some() || additional_field_count > 0);
 
     let len = serialized_fields
         .map(|field| match field.attrs.skip_serializing_if() {
diff --git a/test_suite/tests/test_macros.rs b/test_suite/tests/test_macros.rs
index 3e6e3f1b..e034af68 100644
--- a/test_suite/tests/test_macros.rs
+++ b/test_suite/tests/test_macros.rs
@@ -1420,12 +1420,9 @@ fn test_internally_tagged_braced_struct_with_zero_fields() {
     struct S {}
 
     assert_tokens(
-        &S{ },
+        &S {},
         &[
-            Token::Struct {
-                name: "S",
-                len: 1,
-            },
+            Token::Struct { name: "S", len: 1 },
             Token::Str("type"),
             Token::Str("S"),
             Token::StructEnd,