diff --git a/crates/lanparty-client-tap/src/windows.rs b/crates/lanparty-client-tap/src/windows.rs
index cf1952c..8569cf7 100644
--- a/crates/lanparty-client-tap/src/windows.rs
+++ b/crates/lanparty-client-tap/src/windows.rs
@@ -234,6 +234,16 @@ pub fn available_adapters() -> Result<Vec<TapAdapterInfo>> {
 #[derive(Debug)]
 struct OwnedHandle(HANDLE);
 
+// SAFETY: Windows file handles are process-wide kernel object references that may be used from
+// multiple threads. `OwnedHandle` only closes the handle in `Drop`; callers must still uphold any
+// higher-level synchronization required by the device protocol.
+unsafe impl Send for OwnedHandle {}
+
+// SAFETY: Sharing references to `OwnedHandle` only exposes the raw handle to synchronous Windows
+// APIs. The handle value itself is immutable, and Windows permits issuing I/O on a file handle from
+// more than one thread.
+unsafe impl Sync for OwnedHandle {}
+
 impl OwnedHandle {
     fn new(handle: HANDLE) -> io::Result<Self> {
         if handle == INVALID_HANDLE_VALUE {