diff --git a/embassy-stm32/src/time_driver.rs b/embassy-stm32/src/time_driver.rs
index 8cf74ef6c..00aa3cfa4 100644
--- a/embassy-stm32/src/time_driver.rs
+++ b/embassy-stm32/src/time_driver.rs
@@ -410,7 +410,7 @@ impl RtcDriver {
         regs_gp16().cnt().write(|w| w.set_cnt(cnt as u16));
 
         // Now, recompute all alarms
-        for i in 0..ALARM_COUNT {
+        for i in 0..self.alarm_count.load(Ordering::Relaxed) as usize {
             let alarm_handle = unsafe { AlarmHandle::new(i as u8) };
             let alarm = self.get_alarm(cs, alarm_handle);