diff --git a/util_windows.go b/util_windows.go
index 08951ef..e7789c1 100644
--- a/util_windows.go
+++ b/util_windows.go
@@ -66,7 +66,7 @@ var (
 	systemParametersInfo         = user32.NewProc("SystemParametersInfoW")
 	setWindowPos                 = user32.NewProc("SetWindowPos")
 	getWindowRect                = user32.NewProc("GetWindowRect")
-	setWindowLong                = user32.NewProc("SetWindowLongPtrW")
+	setWindowLong                = user32.NewProc("SetWindowLongW")
 	getSystemMetrics             = user32.NewProc("GetSystemMetrics")
 	unregisterClass              = user32.NewProc("UnregisterClassW")
 	registerClassEx              = user32.NewProc("RegisterClassExW")