diff --git a/hashes/src/hash160.rs b/hashes/src/hash160.rs
index 41098a8a5..21697f79c 100644
--- a/hashes/src/hash160.rs
+++ b/hashes/src/hash160.rs
@@ -10,7 +10,6 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::str;
 
 use crate::{ripemd160, sha256, FromSliceError};
 
diff --git a/hashes/src/internal_macros.rs b/hashes/src/internal_macros.rs
index 9b3f9dde6..5635020ef 100644
--- a/hashes/src/internal_macros.rs
+++ b/hashes/src/internal_macros.rs
@@ -86,7 +86,7 @@ macro_rules! hash_trait_impls {
             }
         }
 
-        impl<$($gen: $gent),*> str::FromStr for Hash<$($gen),*> {
+        impl<$($gen: $gent),*> $crate::_export::_core::str::FromStr for Hash<$($gen),*> {
             type Err = $crate::hex::HexToArrayError;
             fn from_str(s: &str) -> $crate::_export::_core::result::Result<Self, Self::Err> {
                 use $crate::{Hash, hex::{FromHex}};
diff --git a/hashes/src/ripemd160.rs b/hashes/src/ripemd160.rs
index 1581dd242..8c204b81d 100644
--- a/hashes/src/ripemd160.rs
+++ b/hashes/src/ripemd160.rs
@@ -5,7 +5,7 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::{cmp, str};
+use core::cmp;
 
 use crate::{FromSliceError, HashEngine as _};
 
diff --git a/hashes/src/sha1.rs b/hashes/src/sha1.rs
index 00d8446de..663900efd 100644
--- a/hashes/src/sha1.rs
+++ b/hashes/src/sha1.rs
@@ -5,7 +5,7 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::{cmp, str};
+use core::cmp;
 
 use crate::{FromSliceError, HashEngine as _};
 
diff --git a/hashes/src/sha256.rs b/hashes/src/sha256.rs
index 8affa07b1..85f835d36 100644
--- a/hashes/src/sha256.rs
+++ b/hashes/src/sha256.rs
@@ -9,7 +9,7 @@ use core::arch::x86::*;
 use core::arch::x86_64::*;
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::{cmp, str};
+use core::cmp;
 
 use crate::{sha256d, FromSliceError, HashEngine as _};
 
@@ -126,7 +126,7 @@ impl<I: SliceIndex<[u8]>> Index<I> for Midstate {
     fn index(&self, index: I) -> &Self::Output { &self.0[index] }
 }
 
-impl str::FromStr for Midstate {
+impl core::str::FromStr for Midstate {
     type Err = hex::HexToArrayError;
     fn from_str(s: &str) -> Result<Self, Self::Err> { hex::FromHex::from_hex(s) }
 }
diff --git a/hashes/src/sha256d.rs b/hashes/src/sha256d.rs
index fb3b0c5e7..3628a8783 100644
--- a/hashes/src/sha256d.rs
+++ b/hashes/src/sha256d.rs
@@ -5,7 +5,6 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::str;
 
 use crate::{sha256, FromSliceError};
 
diff --git a/hashes/src/sha256t.rs b/hashes/src/sha256t.rs
index 1a613cd39..e7c72a7be 100644
--- a/hashes/src/sha256t.rs
+++ b/hashes/src/sha256t.rs
@@ -6,7 +6,7 @@
 use core::marker::PhantomData;
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::{cmp, str};
+use core::cmp;
 
 use crate::{sha256, FromSliceError};
 
diff --git a/hashes/src/sha384.rs b/hashes/src/sha384.rs
index a94387536..ce23c3118 100644
--- a/hashes/src/sha384.rs
+++ b/hashes/src/sha384.rs
@@ -4,7 +4,6 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::str;
 
 use crate::{sha512, FromSliceError};
 
diff --git a/hashes/src/sha512.rs b/hashes/src/sha512.rs
index ae6155f90..9e7f4be2e 100644
--- a/hashes/src/sha512.rs
+++ b/hashes/src/sha512.rs
@@ -5,7 +5,7 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::{cmp, str};
+use core::cmp;
 
 use crate::{FromSliceError, HashEngine as _};
 
diff --git a/hashes/src/sha512_256.rs b/hashes/src/sha512_256.rs
index e5c366247..bcaee9216 100644
--- a/hashes/src/sha512_256.rs
+++ b/hashes/src/sha512_256.rs
@@ -9,7 +9,6 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::str;
 
 use crate::{sha512, FromSliceError};
 
diff --git a/hashes/src/siphash24.rs b/hashes/src/siphash24.rs
index a20c1d331..81434aef5 100644
--- a/hashes/src/siphash24.rs
+++ b/hashes/src/siphash24.rs
@@ -5,7 +5,7 @@
 
 use core::ops::Index;
 use core::slice::SliceIndex;
-use core::{cmp, mem, ptr, str};
+use core::{cmp, mem, ptr};
 
 use crate::{FromSliceError, Hash as _, HashEngine as _};