diff --git a/teletypewriter/src/windows/child.rs b/teletypewriter/src/windows/child.rs
index cd214e56fb..108dcb2012 100644
--- a/teletypewriter/src/windows/child.rs
+++ b/teletypewriter/src/windows/child.rs
@@ -33,7 +33,7 @@ impl ChildExitWatcher {
     pub fn new(child_handle: HANDLE) -> Result<ChildExitWatcher, Error> {
         let (event_tx, event_rx) = channel::<ChildEvent>();
 
-        let mut wait_handle: HANDLE = 0;
+        let mut wait_handle: HANDLE = std::ptr::null_mut();
         let sender_ref = Box::new(event_tx);
 
         let success = unsafe {
diff --git a/teletypewriter/src/windows/conpty.rs b/teletypewriter/src/windows/conpty.rs
index 004071ab9a..6912f29d6f 100644
--- a/teletypewriter/src/windows/conpty.rs
+++ b/teletypewriter/src/windows/conpty.rs
@@ -68,7 +68,7 @@ impl ConptyApi {
         type LoadedFn = unsafe extern "system" fn() -> isize;
         unsafe {
             let hmodule = LoadLibraryW(w!("conpty.dll"));
-            if hmodule == 0 {
+            if hmodule == std::ptr::null_mut() {
                 return None;
             }
             let create_fn = GetProcAddress(hmodule, s!("CreatePseudoConsole"))?;
diff --git a/teletypewriter/src/windows/pipes.rs b/teletypewriter/src/windows/pipes.rs
index f877a6e811..8253b6d6b2 100644
--- a/teletypewriter/src/windows/pipes.rs
+++ b/teletypewriter/src/windows/pipes.rs
@@ -201,7 +201,7 @@ impl Drop for EventedAnonRead {
 
         // Stop reader thread waiting for pipe contents
         unsafe {
-            CancelSynchronousIo(thread.as_raw_handle() as isize);
+            CancelSynchronousIo(thread.as_raw_handle());
         }
 
         thread