diff --git a/Cargo.toml b/Cargo.toml
index 2915bfa..af7b526 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,7 +47,7 @@ optional = true
 libc = "0.2.70"
 
 [target.'cfg(windows)'.dependencies]
-wepoll-binding = "2.0.2"
+wepoll-sys = "2.0.0"
 
 [dev-dependencies]
 futures = { version = "0.3.5", default-features = false, features = ["std"] }
diff --git a/src/reactor.rs b/src/reactor.rs
index 475f21c..d1ae330 100644
--- a/src/reactor.rs
+++ b/src/reactor.rs
@@ -486,7 +486,7 @@ mod sys {
         pub fn new() -> io::Result<Reactor> {
             let epoll_fd = epoll_create1()?;
             let io_event = Lazy::<IoEvent>::new(|| IoEvent::new().unwrap());
-            Ok(Reactor { epoll_fd })
+            Ok(Reactor { epoll_fd, io_event })
         }
         pub fn register(&self, fd: RawFd, key: usize) -> io::Result<()> {
             let ev = &mut EpollEvent::new(0, key as u64);
@@ -694,28 +694,43 @@ mod sys {
 /// Raw bindings to wepoll (Windows).
 #[cfg(target_os = "windows")]
 mod sys {
+    use std::convert::TryInto;
     use std::io;
+    use std::os::raw::c_int;
     use std::os::windows::io::{AsRawSocket, RawSocket};
     use std::time::Duration;
 
     use once_cell::sync::Lazy;
-    use wepoll_binding::{Epoll, EventFlag};
+    use wepoll_sys::*;
 
     use crate::io_event::IoEvent;
 
     pub struct Reactor {
-        epoll: Epoll,
+        handle: HANDLE,
         io_event: Lazy<IoEvent>,
     }
+    unsafe impl Send for Reactor {}
+    unsafe impl Sync for Reactor {}
     impl Reactor {
         pub fn new() -> io::Result<Reactor> {
-            let epoll = Epoll::new()?;
+            let handle = unsafe { epoll_create1(0) };
+            if handle.is_null() {
+                return Err(io::Error::last_os_error());
+            }
             let io_event = Lazy::<IoEvent>::new(|| IoEvent::new().unwrap());
-            Ok(Reactor { epoll, io_event })
+            Ok(Reactor { handle, io_event })
         }
         pub fn register(&self, sock: RawSocket, key: usize) -> io::Result<()> {
-            self.epoll
-                .register(&As(sock), EventFlag::empty(), key as u64)
+            let mut ev = epoll_event {
+                events: 0,
+                data: epoll_data { u64: key as u64 },
+            };
+            let ret =
+                unsafe { epoll_ctl(self.handle, EPOLL_CTL_ADD as c_int, sock as SOCKET, &mut ev) };
+            if ret == -1 {
+                return Err(io::Error::last_os_error());
+            }
+            Ok(())
         }
         pub fn reregister(
             &self,
@@ -724,30 +739,66 @@ mod sys {
             read: bool,
             write: bool,
         ) -> io::Result<()> {
-            let mut flags = EventFlag::ONESHOT;
+            let mut flags = EPOLLONESHOT;
             if read {
                 flags |= read_flags();
             }
             if write {
                 flags |= write_flags();
             }
-            self.epoll.reregister(&As(sock), flags, key as u64)
+            let mut ev = epoll_event {
+                events: flags as u32,
+                data: epoll_data { u64: key as u64 },
+            };
+            let ret =
+                unsafe { epoll_ctl(self.handle, EPOLL_CTL_MOD as c_int, sock as SOCKET, &mut ev) };
+            if ret == -1 {
+                return Err(io::Error::last_os_error());
+            }
+            Ok(())
         }
         pub fn deregister(&self, sock: RawSocket) -> io::Result<()> {
-            self.epoll.deregister(&As(sock))
+            let ret = unsafe {
+                epoll_ctl(
+                    self.handle,
+                    EPOLL_CTL_DEL as c_int,
+                    sock as SOCKET,
+                    0 as *mut epoll_event,
+                )
+            };
+            if ret == -1 {
+                return Err(io::Error::last_os_error());
+            }
+            Ok(())
         }
         pub fn wait(&self, events: &mut Events, timeout: Option<Duration>) -> io::Result<usize> {
-            let timeout = timeout.map(|t| {
-                if t == Duration::from_millis(0) {
-                    t
-                } else {
-                    t.max(Duration::from_millis(1))
+            let timeout_ms = match timeout {
+                None => -1,
+                Some(t) => {
+                    if t == Duration::from_millis(0) {
+                        0
+                    } else {
+                        t.max(Duration::from_millis(1))
+                            .as_millis()
+                            .try_into()
+                            .unwrap_or(c_int::MAX)
+                    }
                 }
-            });
-            events.0.clear();
-            let res = self.epoll.poll(&mut events.0, timeout);
+            };
+            let ret = unsafe {
+                epoll_wait(
+                    self.handle,
+                    events.list.as_mut_ptr(),
+                    events.list.len() as c_int,
+                    timeout_ms,
+                )
+            };
+            if ret == -1 {
+                return Err(io::Error::last_os_error());
+            }
             self.io_event.clear();
-            res
+            events.len = ret as usize;
+            Ok(ret as usize)
         }
         pub fn notify(&self) -> io::Result<()> {
             self.io_event.notify();
@@ -760,23 +811,35 @@ mod sys {
             self.0
         }
     }
-    fn read_flags() -> EventFlag {
-        EventFlag::IN | EventFlag::RDHUP | EventFlag::HUP | EventFlag::ERR | EventFlag::PRI
+    fn read_flags() -> u32 {
+        EPOLLIN | EPOLLRDHUP | EPOLLHUP | EPOLLERR | EPOLLPRI
     }
-    fn write_flags() -> EventFlag {
-        EventFlag::OUT | EventFlag::HUP | EventFlag::ERR
+    fn write_flags() -> u32 {
+        EPOLLOUT | EPOLLHUP | EPOLLERR
     }
 
-    pub struct Events(wepoll_binding::Events);
+    pub struct Events {
+        list: Box<[epoll_event]>,
+        len: usize,
+    }
+    unsafe impl Send for Events {}
+    unsafe impl Sync for Events {}
     impl Events {
         pub fn new() -> Events {
-            Events(wepoll_binding::Events::with_capacity(1000))
+            let ev = epoll_event {
+                events: 0,
+                data: epoll_data { u64: 0 },
+            };
+            Events {
+                list: vec![ev; 1000].into_boxed_slice(),
+                len: 0,
+            }
         }
         pub fn iter(&self) -> impl Iterator<Item = Event> + '_ {
-            self.0.iter().map(|ev| Event {
-                readable: ev.flags().intersects(read_flags()),
-                writable: ev.flags().intersects(write_flags()),
-                key: ev.data() as usize,
+            self.list[..self.len].iter().map(|ev| Event {
+                readable: (ev.events & read_flags()) != 0,
+                writable: (ev.events & write_flags()) != 0,
+                key: unsafe { ev.data.u64 } as usize,
             })
         }
     }