diff --git a/rust/src/network.rs b/rust/src/network.rs
index dfe545e..4c459cc 100644
--- a/rust/src/network.rs
+++ b/rust/src/network.rs
@@ -3,6 +3,7 @@ use crate::config::NetworkConfig;
 use crate::fat_error::{ContextExt, FatError, FatResult};
 use crate::hal::{PlantHal, HAL};
 use crate::mqtt;
+use crate::util::mk_static;
 use alloc::string::{String, ToString};
 use alloc::sync::Arc;
 use chrono::{DateTime, Utc};
@@ -196,15 +197,6 @@ pub(crate) async fn run_dhcp(stack: Stack<'static>, ip: Ipv4Addr) {
     }
 }
 
-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
-    }};
-}
-
 pub async fn wifi_ap(
     ssid: String,
     interface_ap: Interface<'static>,