diff --git a/src/bin/day22.rs b/src/bin/day22.rs
index ec03bca..e622261 100644
--- a/src/bin/day22.rs
+++ b/src/bin/day22.rs
@@ -324,7 +324,7 @@ impl Solution<Input, Output> for Day22 {
             let steps: String = it
                 .clone()
                 .skip(skip)
-                .take_while(|c| c.is_digit(10))
+                .take_while(|c| c.is_ascii_digit())
                 .collect();
             if !steps.is_empty() {
                 // found a move instruction
@@ -333,7 +333,7 @@ impl Solution<Input, Output> for Day22 {
                 continue;
             }
 
-            match it.clone().skip(skip).next().unwrap() {
+            match it.clone().nth(skip).unwrap() {
                 'L' => instructions.push(Instruction::TurnLeft),
                 'R' => instructions.push(Instruction::TurnRight),
                 x => panic!("Invalid turn: {}", x),