diff --git a/src/backends/metal.rs b/src/backends/metal.rs
index de329aa3..d9d916e9 100644
--- a/src/backends/metal.rs
+++ b/src/backends/metal.rs
@@ -280,8 +280,8 @@ pub async fn create(state: &Rc<State>) -> Result<Rc<MetalBackend>, MetalError> {
     });
     let udev = Rc::new(Udev::new()?);
     let monitor = Rc::new(udev.create_monitor()?);
-    monitor.add_match_subsystem_devtype(Some("input"), None)?;
-    monitor.add_match_subsystem_devtype(Some("drm"), None)?;
+    monitor.add_match_subsystem_devtype(Some(b"input"), None)?;
+    monitor.add_match_subsystem_devtype(Some(b"drm"), None)?;
     monitor.enable_receiving()?;
     let libinput = Rc::new(LibInput::new(device_holder.clone())?);
     let monitor_fd = dup_fd(monitor.fd())?;
diff --git a/src/udev.rs b/src/udev.rs
index 45bdbbc5..b5bc97b1 100644
--- a/src/udev.rs
+++ b/src/udev.rs
@@ -218,7 +218,7 @@ impl UdevMonitor {
 
     pub fn add_match_subsystem_devtype(
         &self,
-        subsystem: Option<&str>,
+        subsystem: Option<&[u8]>,
         devtype: Option<&str>,
     ) -> Result<(), UdevError> {
         let subsystem = subsystem.map(|s| s.into_ustr());