diff --git a/rust/puzzles/day1.rs b/rust/puzzles/day1.rs
index 2d00a62..510a107 100644
--- a/rust/puzzles/day1.rs
+++ b/rust/puzzles/day1.rs
@@ -2,8 +2,8 @@ use crate::puzzle::Puzzle;
 use nom::{
     Parser,
     branch::alt,
-    character::complete::{char, digit1, newline},
-    combinator::{eof, map_res, value},
+    character::complete::{char, i32, newline},
+    combinator::{eof, value},
     error::Error,
     multi::separated_list1,
     sequence::{pair, terminated},
@@ -12,7 +12,7 @@ use nom::{
 pub const PUZZLE: Puzzle<Vec<(Direction, i32)>, 2> = Puzzle {
     number: 1,
     parser: |input| {
-        terminated(
+        terminated::<_, _, Error<&str>, _, _>(
             terminated(
                 separated_list1(
                     newline,
@@ -21,7 +21,7 @@ pub const PUZZLE: Puzzle<Vec<(Direction, i32)>, 2> = Puzzle {
                             value(Direction::L, char('L')),
                             value(Direction::R, char('R')),
                         )),
-                        parse_int(),
+                        i32,
                     ),
                 ),
                 newline,
@@ -83,7 +83,3 @@ fn step(i: i32, d: Direction, p: i32) -> (i32, i32) {
     };
     (p1.div_euclid(100), p1.rem_euclid(100))
 }
-
-fn parse_int<'a>() -> impl Parser<&'a str, Output = i32, Error = Error<&'a str>> {
-    map_res(digit1, |s: &str| s.parse::<i32>())
-}
diff --git a/rust/puzzles/day2.rs b/rust/puzzles/day2.rs
index bc9063d..1171c55 100644
--- a/rust/puzzles/day2.rs
+++ b/rust/puzzles/day2.rs
@@ -1,8 +1,8 @@
 use crate::puzzle::Puzzle;
 use nom::{
     Parser,
-    character::complete::{char, digit1, newline},
-    combinator::{eof, map_res},
+    character::complete::{char, newline, usize},
+    combinator::eof,
     error::Error,
     multi::separated_list1,
     sequence::{separated_pair, terminated},
@@ -11,12 +11,9 @@ use nom::{
 pub const PUZZLE: Puzzle<Vec<(usize, usize)>, 2> = Puzzle {
     number: 2,
     parser: |input| {
-        terminated(
+        terminated::<_, _, Error<&str>, _, _>(
             terminated(
-                separated_list1(
-                    char(','),
-                    separated_pair(parse_int(), char('-'), parse_int()),
-                ),
+                separated_list1(char(','), separated_pair(usize, char('-'), usize)),
                 newline,
             ),
             eof,
@@ -70,7 +67,3 @@ fn equal_chunks(n: &String, i: usize) -> bool {
         Some(x) => chunks.all(|y| y == x),
     }
 }
-
-fn parse_int<'a>() -> impl Parser<&'a str, Output = usize, Error = Error<&'a str>> {
-    map_res(digit1, |s: &str| s.parse::<usize>())
-}