diff --git a/Cargo.toml b/Cargo.toml
index bb84d24ba..7c0c39e8e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -58,7 +58,6 @@ libc = "0.2.86"
 [target.'cfg(windows)'.dependencies]
 miow   = "0.3.6"
 winapi = { version = "0.3", features = ["winsock2", "mswsock", "mstcpip"] }
-ntapi  = "0.3"
 
 [dev-dependencies]
 env_logger = { version = "0.6.2", default-features = false }
diff --git a/src/sys/windows/afd.rs b/src/sys/windows/afd.rs
index 6241a45ef..aa90baefa 100644
--- a/src/sys/windows/afd.rs
+++ b/src/sys/windows/afd.rs
@@ -1,6 +1,6 @@
-use ntapi::ntioapi::{IO_STATUS_BLOCK_u, IO_STATUS_BLOCK};
-use ntapi::ntioapi::{NtCancelIoFileEx, NtDeviceIoControlFile};
-use ntapi::ntrtl::RtlNtStatusToDosError;
+use super::RtlNtStatusToDosError;
+use super::{IO_STATUS_BLOCK_u, IO_STATUS_BLOCK};
+use super::{NtCancelIoFileEx, NtDeviceIoControlFile};
 use std::fmt;
 use std::fs::File;
 use std::io;
@@ -117,7 +117,7 @@ cfg_io_source! {
     use std::sync::atomic::{AtomicUsize, Ordering};
 
     use miow::iocp::CompletionPort;
-    use ntapi::ntioapi::{NtCreateFile, FILE_OPEN};
+    use super::{NtCreateFile, FILE_OPEN};
     use winapi::shared::ntdef::{OBJECT_ATTRIBUTES, UNICODE_STRING, USHORT, WCHAR};
     use winapi::um::handleapi::INVALID_HANDLE_VALUE;
     use winapi::um::winbase::{SetFileCompletionNotificationModes, FILE_SKIP_SET_EVENT_ON_HANDLE};
diff --git a/src/sys/windows/io_status_block.rs b/src/sys/windows/io_status_block.rs
index 3e6033496..ead4f8320 100644
--- a/src/sys/windows/io_status_block.rs
+++ b/src/sys/windows/io_status_block.rs
@@ -1,12 +1,12 @@
 use std::fmt;
 use std::ops::{Deref, DerefMut};
 
-use ntapi::ntioapi::IO_STATUS_BLOCK;
+use super::IO_STATUS_BLOCK;
 
 pub struct IoStatusBlock(IO_STATUS_BLOCK);
 
 cfg_io_source! {
-    use ntapi::ntioapi::IO_STATUS_BLOCK_u;
+    use super::IO_STATUS_BLOCK_u;
 
     impl IoStatusBlock {
         pub fn zeroed() -> Self {
diff --git a/src/sys/windows/mod.rs b/src/sys/windows/mod.rs
index 98b6fc63e..6febae395 100644
--- a/src/sys/windows/mod.rs
+++ b/src/sys/windows/mod.rs
@@ -4,6 +4,12 @@ mod io_status_block;
 pub mod event;
 pub use event::{Event, Events};
 
+mod ntapi;
+pub(crate) use ntapi::{
+    IO_STATUS_BLOCK_u, NtCancelIoFileEx, NtDeviceIoControlFile, RtlNtStatusToDosError,
+    IO_STATUS_BLOCK,
+};
+
 mod selector;
 pub use selector::{Selector, SelectorInner, SockState};
 
@@ -30,6 +36,8 @@ cfg_net! {
 
     pub(crate) mod tcp;
     pub(crate) mod udp;
+
+    pub(crate) use ntapi::{NtCreateFile, FILE_OPEN};
 }
 
 cfg_os_ext! {
diff --git a/src/sys/windows/ntapi.rs b/src/sys/windows/ntapi.rs
new file mode 100644
index 000000000..a7493c304
--- /dev/null
+++ b/src/sys/windows/ntapi.rs
@@ -0,0 +1,162 @@
+// The code in this file is adapted from the ntapi crate
+// version 0.3.7 (https://crates.io/crates/ntapi/0.3.7)
+// which was released under the MIT License or
+// Apache License 2.0.
+// This was necessary because ntapi v.0.3.7
+// uses code which is rejected in rust versions greater
+// than or equal to version 1.68.
+// See here for further information on the error:
+// https://github.com/rust-lang/rust/issues/82523.
+
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+use winapi::shared::{
+    basetsd::ULONG_PTR,
+    ntdef::{HANDLE, NTSTATUS, PVOID, ULONG},
+};
+
+pub type PIO_STATUS_BLOCK = *mut IO_STATUS_BLOCK;
+
+macro_rules! EXTERN {
+    (extern $c:tt {$(
+        fn $n:ident ($( $p:tt $(: $t:ty)?),* $(,)?) $(-> $r:ty)?;
+    )+}) => {
+        #[cfg_attr(all(target_env = "msvc", feature = "user"), link(name = "ntdll"))]
+        #[cfg_attr(all(target_env = "msvc", feature = "kernel"), link(name = "ntoskrnl"))]
+        extern $c {$(
+            pub fn $n(
+                $($p $(: $t)?),*
+            ) $(-> $r)?;
+        )+}
+        $(
+            #[cfg(feature = "func-types")]
+            pub type $n = unsafe extern $c fn($($p $(: $t)?),*) $(-> $r)?;
+        )+
+    };
+    (extern $c:tt {$(
+        static mut $n:ident : $t:ty;
+    )+}) => {
+        #[cfg_attr(all(target_env = "msvc", feature = "user"), link(name = "ntdll"))]
+        extern $c {$(
+            pub static mut $n: $t;
+        )+}
+    };
+}
+
+macro_rules! FN {
+    (stdcall $func:ident($($p:ident: $t:ty,)*) -> $ret:ty) => (
+        pub type $func = Option<unsafe extern "system" fn($($p: $t,)*) -> $ret>;
+    );
+    (cdecl $func:ident($($p:ident: $t:ty,)*) -> $ret:ty) => (
+        pub type $func = Option<unsafe extern "C" fn($($p: $t,)*) -> $ret>;
+    );
+}
+
+macro_rules! STRUCT {
+    (#[debug] $($rest:tt)*) => (
+        STRUCT!{#[cfg_attr(feature = "impl-debug", derive(Debug))] $($rest)*}
+    );
+    ($(#[$attrs:meta])* struct $name:ident {
+        $($field:ident: $ftype:ty,)+
+    }) => (
+        #[repr(C)] #[derive(Copy)] $(#[$attrs])*
+        pub struct $name {
+            $(pub $field: $ftype,)+
+        }
+        impl Clone for $name {
+            #[inline]
+            fn clone(&self) -> $name { *self }
+        }
+        #[cfg(feature = "impl-default")]
+        impl Default for $name {
+            #[inline]
+            fn default() -> $name { unsafe { $crate::_core::mem::zeroed() } }
+        }
+    );
+}
+
+macro_rules! UNION {
+    ($(#[$attrs:meta])* union $name:ident {
+        $($variant:ident: $ftype:ty,)+
+    }) => (
+        #[repr(C)] $(#[$attrs])*
+        pub union $name {
+            $(pub $variant: $ftype,)+
+        }
+        impl Copy for $name {}
+        impl Clone for $name {
+            #[inline]
+            fn clone(&self) -> $name { *self }
+        }
+        #[cfg(feature = "impl-default")]
+        impl Default for $name {
+            #[inline]
+            fn default() -> $name { unsafe { $crate::_core::mem::zeroed() } }
+        }
+    );
+}
+
+EXTERN! {extern "system" {
+    fn NtCancelIoFileEx(
+        FileHandle: HANDLE,
+        IoRequestToCancel: PIO_STATUS_BLOCK,
+        IoStatusBlock: PIO_STATUS_BLOCK,
+    ) -> NTSTATUS;
+    fn NtDeviceIoControlFile(
+        FileHandle: HANDLE,
+        Event: HANDLE,
+        ApcRoutine: PIO_APC_ROUTINE,
+        ApcContext: PVOID,
+        IoStatusBlock: PIO_STATUS_BLOCK,
+        IoControlCode: ULONG,
+        InputBuffer: PVOID,
+        InputBufferLength: ULONG,
+        OutputBuffer: PVOID,
+        OutputBufferLength: ULONG,
+    ) -> NTSTATUS;
+    fn RtlNtStatusToDosError(
+        Status: NTSTATUS,
+    ) -> ULONG;
+}}
+
+FN! {stdcall PIO_APC_ROUTINE(
+    ApcContext: PVOID,
+    IoStatusBlock: PIO_STATUS_BLOCK,
+    Reserved: ULONG,
+) -> ()}
+
+STRUCT! {struct IO_STATUS_BLOCK {
+    u: IO_STATUS_BLOCK_u,
+    Information: ULONG_PTR,
+}}
+
+UNION! {union IO_STATUS_BLOCK_u {
+    Status: NTSTATUS,
+    Pointer: PVOID,
+}}
+
+cfg_net! {
+    use winapi::{
+        shared::ntdef::{PHANDLE, PLARGE_INTEGER, POBJECT_ATTRIBUTES},
+        um::winnt::ACCESS_MASK,
+    };
+
+    pub(crate) const FILE_OPEN: ULONG = 0x00000001;
+
+    EXTERN! {extern "system" {
+        fn NtCreateFile(
+            FileHandle: PHANDLE,
+            DesiredAccess: ACCESS_MASK,
+            ObjectAttributes: POBJECT_ATTRIBUTES,
+            IoStatusBlock: PIO_STATUS_BLOCK,
+            AllocationSize: PLARGE_INTEGER,
+            FileAttributes: ULONG,
+            ShareAccess: ULONG,
+            CreateDisposition: ULONG,
+            CreateOptions: ULONG,
+            EaBuffer: PVOID,
+            EaLength: ULONG,
+        ) -> NTSTATUS;
+    }}
+}