diff --git a/src/array/fixed_size_list/mutable.rs b/src/array/fixed_size_list/mutable.rs
index d2621807832..acab58649b0 100644
--- a/src/array/fixed_size_list/mutable.rs
+++ b/src/array/fixed_size_list/mutable.rs
@@ -44,7 +44,7 @@ impl<M: MutableArray> MutableFixedSizeListArray<M> {
     /// Creates a new [`MutableFixedSizeListArray`] from a [`MutableArray`] and size.
     pub fn new_with_field(values: M, name: &str, nullable: bool, size: usize) -> Self {
         let data_type = DataType::FixedSizeList(
-            Box::new(Field::new(name, values.data_type().clone(), nullable)), 
+            Box::new(Field::new(name, values.data_type().clone(), nullable)),
             size,
         );
         assert_eq!(values.len(), 0);
diff --git a/tests/it/array/fixed_size_list/mutable.rs b/tests/it/array/fixed_size_list/mutable.rs
index 1de35d40d3e..39826645ba7 100644
--- a/tests/it/array/fixed_size_list/mutable.rs
+++ b/tests/it/array/fixed_size_list/mutable.rs
@@ -1,5 +1,5 @@
 use arrow2::array::*;
-use arrow2::datatypes::{DataType,Field};
+use arrow2::datatypes::{DataType, Field};
 
 #[test]
 fn primitive() {
@@ -34,17 +34,21 @@ fn new_with_field() {
         Some(vec![Some(4), None, Some(6)]),
     ];
 
-    let mut list = MutableFixedSizeListArray::new_with_field(MutablePrimitiveArray::<i32>::new(), "custom_items", false, 3);
+    let mut list = MutableFixedSizeListArray::new_with_field(
+        MutablePrimitiveArray::<i32>::new(),
+        "custom_items",
+        false,
+        3,
+    );
     list.try_extend(data).unwrap();
     let list: FixedSizeListArray = list.into();
 
-    assert_eq!(list.data_type(), &DataType::FixedSizeList(
-        Box::new(Field::new(
-            "custom_items", 
-            DataType::Int32,
-            false
-            )),
-        3)
+    assert_eq!(
+        list.data_type(),
+        &DataType::FixedSizeList(
+            Box::new(Field::new("custom_items", DataType::Int32, false)),
+            3
+        )
     );
 
     let a = list.value(0);