diff --git a/rust/src/hal/mod.rs b/rust/src/hal/mod.rs
index 9a03799..27980eb 100644
--- a/rust/src/hal/mod.rs
+++ b/rust/src/hal/mod.rs
@@ -282,14 +282,7 @@ pub struct FreePeripherals<'a> {
     pub adc1: ADC1<'a>,
 }
 
-macro_rules! mk_static {
-    ($t:ty,$val:expr) => {{
-        static STATIC_CELL: static_cell::StaticCell<$t> = static_cell::StaticCell::new();
-        #[deny(unused_attributes)]
-        let x = STATIC_CELL.uninit().write(($val));
-        x
-    }};
-}
+use crate::util::mk_static;
 
 impl PlantHal {
     pub async fn create() -> Result<Mutex<CriticalSectionRawMutex, HAL<'static>>, FatError> {