diff --git a/rust/src/hal/esp.rs b/rust/src/hal/esp.rs
index 177901e..2306b1e 100644
--- a/rust/src/hal/esp.rs
+++ b/rust/src/hal/esp.rs
@@ -120,15 +120,6 @@ pub struct Esp<'a> {
 // CPU cores/threads, reconsider this.
 unsafe impl Send for Esp<'_> {}
 
-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
-    }};
-}
-
 impl Esp<'_> {
     pub fn get_time(&self) -> DateTime<Utc> {
         DateTime::from_timestamp_micros(self.rtc.current_time_us() as i64)
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> {
diff --git a/rust/src/main.rs b/rust/src/main.rs
index 859509d..92b21c2 100644
--- a/rust/src/main.rs
+++ b/rust/src/main.rs
@@ -71,6 +71,7 @@ mod mqtt;
 mod network;
 mod plant_state;
 mod tank;
+mod util;
 mod webserver;
 
 extern crate alloc;
diff --git a/rust/src/mqtt.rs b/rust/src/mqtt.rs
index 6f37678..2d5718f 100644
--- a/rust/src/mqtt.rs
+++ b/rust/src/mqtt.rs
@@ -110,14 +110,7 @@ async fn publish_inner(subtopic: &str, message: &str) -> FatResult<()> {
     }
 }
 
-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;
 
 pub async fn mqtt_init(
     network_config: &'static NetworkConfig,
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>,
diff --git a/rust/src/util.rs b/rust/src/util.rs
new file mode 100644
index 0000000..9241868
--- /dev/null
+++ b/rust/src/util.rs
@@ -0,0 +1,10 @@
+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(crate) use mk_static;