diff --git a/src/runtime/src/comms.rs b/src/runtime/src/comms.rs
index 71297f27..d12e5781 100644
--- a/src/runtime/src/comms.rs
+++ b/src/runtime/src/comms.rs
@@ -430,10 +430,10 @@ pub fn main(timer: GlobalTimer, cfg: Config) {
                         if let Some(buffer) = &*idle_kernel {
                             info!("Loading idle kernel");
                             let _ = load_kernel(&buffer, &control, None)
-                                .await.map_err(|e| warn!("error loading idle kernel"));
+                                .await.map_err(|_| warn!("error loading idle kernel"));
                             info!("Running idle kernel");
                             let _ = handle_run_kernel(None, &control)
-                                .await.map_err(|e| warn!("error running idle kernel"));
+                                .await.map_err(|_| warn!("error running idle kernel"));
                             info!("Idle kernel terminated");
                         }
                     }).fuse() => (),
diff --git a/src/runtime/src/i2c.rs b/src/runtime/src/i2c.rs
index d0903019..5c06d154 100644
--- a/src/runtime/src/i2c.rs
+++ b/src/runtime/src/i2c.rs
@@ -1,7 +1,6 @@
-use libboard_zynq;
-
 #[cfg(feature = "target_zc706")]
 mod i2c {
+    use libboard_zynq;
     use crate::artiq_raise;
 
     static mut I2C_BUS: Option<libboard_zynq::i2c::I2c> = None;