diff --git a/src/api/win32/mod.rs b/src/api/win32/mod.rs
index 0bc36a75..9d6b2da6 100644
--- a/src/api/win32/mod.rs
+++ b/src/api/win32/mod.rs
@@ -84,6 +84,9 @@ pub struct WindowProxy {
     hwnd: winapi::HWND,
 }
 
+unsafe impl Send for WindowProxy {}
+unsafe impl Sync for WindowProxy {}
+
 impl WindowProxy {
     #[inline]
     pub fn wakeup_event_loop(&self) {