diff --git a/lib/vector-config/src/external/serde_with.rs b/lib/vector-config/src/external/serde_with.rs
index 1165b54be64e29..1ef3a072e69f8c 100644
--- a/lib/vector-config/src/external/serde_with.rs
+++ b/lib/vector-config/src/external/serde_with.rs
@@ -2,12 +2,12 @@ use std::cell::RefCell;
 
 use vector_config_common::{attributes::CustomAttribute, constants};
 
+use crate::schema::generate_optional_schema;
 use crate::{
     num::NumberClass,
     schema::{generate_number_schema, SchemaGenerator, SchemaObject},
     Configurable, GenerateError, Metadata,
 };
-use crate::schema::generate_optional_schema;
 
 // Blanket implementation of `Configurable` for any `serde_with` helper that is also `Configurable`.
 impl<T> Configurable for serde_with::As<T>
@@ -135,7 +135,10 @@ impl Configurable for serde_with::DurationMilliSeconds<u64, serde_with::formats:
 }
 
 impl Configurable for Option<serde_with::DurationMilliSeconds<u64, serde_with::formats::Strict>> {
-    fn generate_schema(gen: &RefCell<SchemaGenerator>) -> Result<SchemaObject, GenerateError> where Self: Sized {
+    fn generate_schema(gen: &RefCell<SchemaGenerator>) -> Result<SchemaObject, GenerateError>
+    where
+        Self: Sized,
+    {
         generate_optional_schema(&u64::as_configurable_ref(), gen)
     }
 }