diff --git a/common/src/fileutils.rs b/common/src/fileutils.rs
index cabeb833c..67713c014 100644
--- a/common/src/fileutils.rs
+++ b/common/src/fileutils.rs
@@ -320,7 +320,7 @@ pub mod windows {
             .get_or_init(|| {
                 let library_name = OsString::from("api-ms-win-core-file-l2-1-4").to_wide_with_nul();
                 let module = unsafe { LoadLibraryW(library_name.as_ptr()) };
-                if module == std::ptr::null_mut() {
+                if module.is_null() {
                     return None;
                 }
                 let name = CString::new("GetFileInformationByName").unwrap();
diff --git a/stdlib/src/overlapped.rs b/stdlib/src/overlapped.rs
index 8877e5bef..234e3be53 100644
--- a/stdlib/src/overlapped.rs
+++ b/stdlib/src/overlapped.rs
@@ -130,7 +130,7 @@ mod _overlapped {
 
     fn mark_as_completed(ov: &mut OVERLAPPED) {
         ov.Internal = 0;
-        if ov.hEvent != std::ptr::null_mut() {
+        if !ov.hEvent.is_null() {
             unsafe { windows_sys::Win32::System::Threading::SetEvent(ov.hEvent) };
         }
     }
@@ -263,7 +263,7 @@ mod _overlapped {
         type Args = (isize,);
 
         fn py_new(cls: PyTypeRef, (mut event,): Self::Args, vm: &VirtualMachine) -> PyResult {
-            if event as isize == INVALID_HANDLE_VALUE as isize {
+            if event == INVALID_HANDLE_VALUE(vm) {
                 event = unsafe {
                     windows_sys::Win32::System::Threading::CreateEventA(
                         std::ptr::null(),
@@ -272,7 +272,7 @@ mod _overlapped {
                         std::ptr::null(),
                     ) as isize
                 };
-                if event as isize == NULL {
+                if event == NULL {
                     return Err(errno_err(vm));
                 }
             }
diff --git a/vm/src/stdlib/nt.rs b/vm/src/stdlib/nt.rs
index bf7dca8b0..ecc63e0aa 100644
--- a/vm/src/stdlib/nt.rs
+++ b/vm/src/stdlib/nt.rs
@@ -150,7 +150,7 @@ pub(crate) mod module {
         }
 
         let h = unsafe { Threading::OpenProcess(Threading::PROCESS_ALL_ACCESS, 0, pid) };
-        if h == std::ptr::null_mut() {
+        if h.is_null() {
             return Err(errno_err(vm));
         }
         let ret = unsafe { Threading::TerminateProcess(h, sig) };
@@ -172,7 +172,7 @@ pub(crate) mod module {
                 _ => return Err(vm.new_value_error("bad file descriptor".to_owned())),
             };
             let h = unsafe { Console::GetStdHandle(stdhandle) };
-            if h == std::ptr::null_mut() {
+            if h.is_null() {
                 return Err(vm.new_os_error("handle cannot be retrieved".to_owned()));
             }
             if h == INVALID_HANDLE_VALUE {