diff --git a/src/iter/test.rs b/src/iter/test.rs
index 62d7f4cb5..08fd57a4c 100644
--- a/src/iter/test.rs
+++ b/src/iter/test.rs
@@ -60,8 +60,7 @@ fn execute_unindexed_range() {
 
 #[test]
 fn execute_pseudo_indexed_range() {
-    use std::i128::MAX;
-    let range = MAX - 1024..MAX;
+    let range = i128::MAX - 1024..i128::MAX;
 
     // Given `Some` length, collecting `Vec` will try to act indexed.
     let a = range.clone().into_par_iter();
diff --git a/src/range.rs b/src/range.rs
index b7131b63a..ed906c7b9 100644
--- a/src/range.rs
+++ b/src/range.rs
@@ -18,9 +18,7 @@
 
 use crate::iter::plumbing::*;
 use crate::iter::*;
-use std::char;
 use std::ops::Range;
-use std::usize;
 
 /// Parallel iterator over a range, implemented for all integer types and `char`.
 ///
@@ -378,8 +376,6 @@ fn check_range_split_at_overflow() {
 
 #[test]
 fn test_i128_len_doesnt_overflow() {
-    use std::{i128, u128};
-
     // Using parse because some versions of rust don't allow long literals
     let octillion: i128 = "1000000000000000000000000000".parse().unwrap();
     let producer = IterProducer {
@@ -395,7 +391,6 @@ fn test_i128_len_doesnt_overflow() {
 
 #[test]
 fn test_u64_opt_len() {
-    use std::{u64, usize};
     assert_eq!(Some(100), (0..100u64).into_par_iter().opt_len());
     assert_eq!(
         Some(usize::MAX),
@@ -414,7 +409,6 @@ fn test_u64_opt_len() {
 
 #[test]
 fn test_u128_opt_len() {
-    use std::{u128, usize};
     assert_eq!(Some(100), (0..100u128).into_par_iter().opt_len());
     assert_eq!(
         Some(usize::MAX),
@@ -430,7 +424,6 @@ fn test_u128_opt_len() {
 #[cfg(target_pointer_width = "64")]
 fn test_usize_i64_overflow() {
     use crate::ThreadPoolBuilder;
-    use std::i64;
 
     let iter = (-2..i64::MAX).into_par_iter();
     assert_eq!(iter.opt_len(), Some(i64::MAX as usize + 2));
diff --git a/src/range_inclusive.rs b/src/range_inclusive.rs
index b7bb0cac7..9c10f0805 100644
--- a/src/range_inclusive.rs
+++ b/src/range_inclusive.rs
@@ -18,7 +18,6 @@
 
 use crate::iter::plumbing::*;
 use crate::iter::*;
-use std::char;
 use std::ops::RangeInclusive;
 
 /// Parallel iterator over an inclusive range, implemented for all integer types and `char`.
@@ -313,7 +312,6 @@ impl IndexedParallelIterator for Iter<char> {
 #[test]
 #[cfg(target_pointer_width = "64")]
 fn test_u32_opt_len() {
-    use std::u32;
     assert_eq!(Some(101), (0..=100u32).into_par_iter().opt_len());
     assert_eq!(
         Some(u32::MAX as usize),
@@ -327,7 +325,6 @@ fn test_u32_opt_len() {
 
 #[test]
 fn test_u64_opt_len() {
-    use std::{u64, usize};
     assert_eq!(Some(101), (0..=100u64).into_par_iter().opt_len());
     assert_eq!(
         Some(usize::MAX),
@@ -339,7 +336,6 @@ fn test_u64_opt_len() {
 
 #[test]
 fn test_u128_opt_len() {
-    use std::{u128, usize};
     assert_eq!(Some(101), (0..=100u128).into_par_iter().opt_len());
     assert_eq!(
         Some(usize::MAX),
@@ -355,7 +351,6 @@ fn test_u128_opt_len() {
 #[cfg(target_pointer_width = "64")]
 fn test_usize_i64_overflow() {
     use crate::ThreadPoolBuilder;
-    use std::i64;
 
     let iter = (-2..=i64::MAX).into_par_iter();
     assert_eq!(iter.opt_len(), Some(i64::MAX as usize + 3));
diff --git a/tests/chars.rs b/tests/chars.rs
index ac8e3f304..6e2804f40 100644
--- a/tests/chars.rs
+++ b/tests/chars.rs
@@ -1,5 +1,4 @@
 use rayon::prelude::*;
-use std::char;
 
 #[test]
 fn half_open_correctness() {