diff --git a/src/winit_windows.rs b/src/winit_windows.rs
index 2cf9076..3eb514d 100644
--- a/src/winit_windows.rs
+++ b/src/winit_windows.rs
@@ -264,9 +264,3 @@ pub fn get_best_videomode(monitor: &winit::monitor::MonitorHandle) -> winit::mon
 
     modes.first().unwrap().clone()
 }
-
-// WARNING: this only works under the assumption that wasm runtime is single threaded
-#[cfg(target_arch = "wasm32")]
-unsafe impl Send for WinitWindows {}
-#[cfg(target_arch = "wasm32")]
-unsafe impl Sync for WinitWindows {}