diff --git a/alacritty/src/panic.rs b/alacritty/src/panic.rs
index 2637f8d6..b39fdbfd 100644
--- a/alacritty/src/panic.rs
+++ b/alacritty/src/panic.rs
@@ -15,7 +15,7 @@ pub fn attach_handler() {
         let msg = format!("{}\n\nPress Ctrl-C to Copy", panic_info);
         unsafe {
             MessageBoxW(
-                0isize,
+                std::ptr::null_mut(),
                 win32_string(&msg).as_ptr(),
                 win32_string("Alacritty: Runtime Error").as_ptr(),
                 MB_ICONERROR | MB_OK | MB_SETFOREGROUND | MB_TASKMODAL,