diff --git a/eth2/utils/ssz_derive/src/lib.rs b/eth2/utils/ssz_derive/src/lib.rs
index fdee88dd9a..cb14e684fa 100644
--- a/eth2/utils/ssz_derive/src/lib.rs
+++ b/eth2/utils/ssz_derive/src/lib.rs
@@ -5,12 +5,14 @@ use quote::quote;
 use syn::{parse_macro_input, DeriveInput};
 
 fn get_named_field_idents<'a>(struct_data: &'a syn::DataStruct) -> Vec<&'a syn::Ident> {
-    struct_data.fields.iter().map(|f| {
-        match &f.ident {
+    struct_data
+        .fields
+        .iter()
+        .map(|f| match &f.ident {
             Some(ref ident) => ident,
-            _ => panic!("ssz_derive only supports named struct fields.")
-        }
-    }).collect()
+            _ => panic!("ssz_derive only supports named struct fields."),
+        })
+        .collect()
 }
 
 #[proc_macro_derive(Encode)]
@@ -21,7 +23,7 @@ pub fn ssz_encode_derive(input: TokenStream) -> TokenStream {
 
     let struct_data = match &item.data {
         syn::Data::Struct(s) => s,
-        _ => panic!("ssz_derive only supports structs.")
+        _ => panic!("ssz_derive only supports structs."),
     };
 
     let field_idents = get_named_field_idents(&struct_data);
@@ -46,7 +48,7 @@ pub fn ssz_decode_derive(input: TokenStream) -> TokenStream {
 
     let struct_data = match &item.data {
         syn::Data::Struct(s) => s,
-        _ => panic!("ssz_derive only supports structs.")
+        _ => panic!("ssz_derive only supports structs."),
     };
 
     let field_idents = get_named_field_idents(&struct_data);