diff --git a/rtic-macros/ui/spawn-local-no-send-sync.rs b/rtic-macros/ui/spawn-local-no-send-sync.rs
index 6295b86d005..83d025446b4 100644
--- a/rtic-macros/ui/spawn-local-no-send-sync.rs
+++ b/rtic-macros/ui/spawn-local-no-send-sync.rs
@@ -1,5 +1,7 @@
 #![no_main]
 
+use std::marker::PhantomData;
+
 #[rtic_macros::mock_app(device = mock, dispatchers = [EXTI0])]
 mod app {
     use super::*;