diff --git a/uitask_windows.go b/uitask_windows.go
index df04d2e..c0b6535 100644
--- a/uitask_windows.go
+++ b/uitask_windows.go
@@ -48,6 +48,8 @@ var (
 )
 
 func msgloop() {
+	runtime.LockOSThread()
+
 	var msg struct {
 		Hwnd	_HWND
 		Message	uint32