diff --git a/2017/rust/src/day_01.rs b/2017/rust/src/day_01.rs
index b526084..6431e65 100644
--- a/2017/rust/src/day_01.rs
+++ b/2017/rust/src/day_01.rs
@@ -5,7 +5,7 @@ pub fn solve(input: &str) -> Result<String, Error> {
     let input: Vec<u32> = input
         .trim()
         .chars()
-        .map(|x| x.to_digit(10).ok_or_else(|| format_err!("")))
+        .map(|x| x.to_digit(10).ok_or_else(|| err_msg("")))
         .collect::<Result<_, _>>()?;
 
     // 1
diff --git a/2017/rust/src/day_04.rs b/2017/rust/src/day_04.rs
index df96579..3033363 100644
--- a/2017/rust/src/day_04.rs
+++ b/2017/rust/src/day_04.rs
@@ -18,7 +18,7 @@ struct Passphrase {
 impl Passphrase {
     fn is_valid(&self) -> bool {
         let mut words = HashSet::new();
-        return !self.words
+        !self.words
             .split_whitespace()
             .map(|word| {
                 let mut chars: Vec<String> = word.chars().map(|x| x.to_string()).collect();
@@ -30,7 +30,7 @@ impl Passphrase {
                     return true;
                 }
                 words.insert(word);
-                return false;
-            });
+                false
+            })
     }
 }