diff --git a/library/std/src/ffi/c_str.rs b/library/std/src/ffi/c_str.rs
index 302f12af6a0f..2a4ef553be39 100644
--- a/library/std/src/ffi/c_str.rs
+++ b/library/std/src/ffi/c_str.rs
@@ -10,7 +10,6 @@
 use crate::fmt::{self, Write};
 use crate::io;
 use crate::mem;
-use crate::memchr;
 use crate::num::NonZeroU8;
 use crate::ops;
 use crate::os::raw::c_char;
@@ -20,6 +19,7 @@
 use crate::str::{self, Utf8Error};
 use crate::sync::Arc;
 use crate::sys;
+use crate::sys_common::memchr;
 
 /// A type representing an owned, C-compatible, nul-terminated string with no nul bytes in the
 /// middle.
diff --git a/library/std/src/io/buffered/linewritershim.rs b/library/std/src/io/buffered/linewritershim.rs
index d0c859d2e0c8..0175d2693e89 100644
--- a/library/std/src/io/buffered/linewritershim.rs
+++ b/library/std/src/io/buffered/linewritershim.rs
@@ -1,5 +1,5 @@
 use crate::io::{self, BufWriter, IoSlice, Write};
-use crate::memchr;
+use crate::sys_common::memchr;
 
 /// Private helper struct for implementing the line-buffered writing logic.
 /// This shim temporarily wraps a BufWriter, and uses its internals to
diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index e18402f8dec1..a8f3412c6111 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -253,12 +253,12 @@
 
 use crate::cmp;
 use crate::fmt;
-use crate::memchr;
 use crate::ops::{Deref, DerefMut};
 use crate::ptr;
 use crate::slice;
 use crate::str;
 use crate::sys;
+use crate::sys_common::memchr;
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::buffered::IntoInnerError;
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 6d11698d2682..442b5628d1dc 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -530,7 +530,6 @@ pub mod task {
 pub mod alloc;
 
 // Private support modules
-mod memchr;
 mod panicking;
 
 // The runtime entry point and a few unstable public functions used by the
diff --git a/library/std/src/sys/hermit/os.rs b/library/std/src/sys/hermit/os.rs
index 81cd68a74e66..40bd393098f5 100644
--- a/library/std/src/sys/hermit/os.rs
+++ b/library/std/src/sys/hermit/os.rs
@@ -4,11 +4,11 @@
 use crate::fmt;
 use crate::io;
 use crate::marker::PhantomData;
-use crate::memchr;
 use crate::path::{self, PathBuf};
 use crate::str;
 use crate::sync::Mutex;
 use crate::sys::hermit::abi;
+use crate::sys::memchr;
 use crate::sys::unsupported;
 use crate::sys_common::os_str_bytes::*;
 use crate::vec;
diff --git a/library/std/src/sys/unix/os.rs b/library/std/src/sys/unix/os.rs
index 51c3e5d175cc..bbc4691d963c 100644
--- a/library/std/src/sys/unix/os.rs
+++ b/library/std/src/sys/unix/os.rs
@@ -13,13 +13,13 @@
 use crate::io;
 use crate::iter;
 use crate::mem;
-use crate::memchr;
 use crate::path::{self, PathBuf};
 use crate::ptr;
 use crate::slice;
 use crate::str;
 use crate::sys::cvt;
 use crate::sys::fd;
+use crate::sys::memchr;
 use crate::sys::rwlock::{RWLockReadGuard, StaticRWLock};
 use crate::sys_common::mutex::{StaticMutex, StaticMutexGuard};
 use crate::vec;
diff --git a/library/std/src/memchr.rs b/library/std/src/sys_common/memchr.rs
similarity index 92%
rename from library/std/src/memchr.rs
rename to library/std/src/sys_common/memchr.rs
index 86a08f75a8d4..b219e8789126 100644
--- a/library/std/src/memchr.rs
+++ b/library/std/src/sys_common/memchr.rs
@@ -1,6 +1,8 @@
 // Original implementation taken from rust-memchr.
 // Copyright 2015 Andrew Gallant, bluss and Nicolas Koch
 
+use crate::sys::memchr as sys;
+
 #[cfg(test)]
 mod tests;
 
@@ -25,7 +27,7 @@
 /// ```
 #[inline]
 pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> {
-    crate::sys::memchr::memchr(needle, haystack)
+    sys::memchr(needle, haystack)
 }
 
 /// A safe interface to `memrchr`.
@@ -45,5 +47,5 @@ pub fn memchr(needle: u8, haystack: &[u8]) -> Option<usize> {
 /// ```
 #[inline]
 pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
-    crate::sys::memchr::memrchr(needle, haystack)
+    sys::memrchr(needle, haystack)
 }
diff --git a/library/std/src/memchr/tests.rs b/library/std/src/sys_common/memchr/tests.rs
similarity index 100%
rename from library/std/src/memchr/tests.rs
rename to library/std/src/sys_common/memchr/tests.rs
diff --git a/library/std/src/sys_common/mod.rs b/library/std/src/sys_common/mod.rs
index 4ef0e72adf02..1a9caa22c924 100644
--- a/library/std/src/sys_common/mod.rs
+++ b/library/std/src/sys_common/mod.rs
@@ -25,6 +25,7 @@
 pub mod condvar;
 pub mod fs;
 pub mod io;
+pub mod memchr;
 pub mod mutex;
 // `doc` is required because `sys/mod.rs` imports `unix/ext/mod.rs` on Windows
 // when generating documentation.