diff --git a/maitake/src/time/timer.rs b/maitake/src/time/timer.rs
index 27fb91d5..1ba650d8 100644
--- a/maitake/src/time/timer.rs
+++ b/maitake/src/time/timer.rs
@@ -501,7 +501,7 @@ impl Timer {
         clock::dur_to_ticks(self.clock.tick_duration(), duration)
     }
 
-    fn advance_locked(&self, core: &mut MutexGuard<'_, wheel::Core>) -> Turn {
+    fn advance_locked(&self, core: &mut wheel::Core) -> Turn {
         // take any pending ticks.
         let pending_ticks = self.pending_ticks.swap(0, AcqRel) as Ticks;
         // we do two separate `advance` calls here instead of advancing once
diff --git a/maitake/src/time/timer/sleep.rs b/maitake/src/time/timer/sleep.rs
index 66f0ca42..92b291f1 100644
--- a/maitake/src/time/timer/sleep.rs
+++ b/maitake/src/time/timer/sleep.rs
@@ -113,8 +113,7 @@ impl Future for Sleep<'_> {
                 let ptr =
                     unsafe { ptr::NonNull::from(Pin::into_inner_unchecked(this.entry.as_mut())) };
                 // Acquire the wheel lock to insert the sleep.
-                let mut core: maitake_sync::spin::MutexGuard<'_, crate::time::timer::wheel::Core> =
-                    this.timer.core();
+                let mut core = this.timer.core();
 
                 // While we are holding the wheel lock, go ahead and advance the
                 // timer, too. This way, the timer wheel gets advanced more
diff --git a/maitake/src/time/timer/tests.rs b/maitake/src/time/timer/tests.rs
index f200409f..4a252a13 100644
--- a/maitake/src/time/timer/tests.rs
+++ b/maitake/src/time/timer/tests.rs
@@ -58,6 +58,8 @@ impl ClockHandle {
         self.advance_ticks_inner(duration.as_millis() as u64)
     }
 
+    // This function isn't used in loom tests.
+    #[cfg_attr(loom, allow(dead_code))]
     pub fn advance_ticks(&self, ticks: Ticks) {
         info!(ticks, "advancing test clock by");
         self.advance_ticks_inner(ticks)
@@ -71,6 +73,8 @@ impl ClockHandle {
         );
     }
 
+    // This function isn't used in loom tests.
+    #[cfg_attr(loom, allow(dead_code))]
     pub fn ticks(&self) -> Ticks {
         self.0.now.load(Ordering::SeqCst)
     }