diff --git a/rp2040-hal/src/timer.rs b/rp2040-hal/src/timer.rs
index 402205f7d..2260df840 100644
--- a/rp2040-hal/src/timer.rs
+++ b/rp2040-hal/src/timer.rs
@@ -172,7 +172,9 @@ impl eh1_0_alpha::delay::DelayNs for Timer {
         // For now, just use microsecond delay, internally. Of course, this
         // might cause a much longer delay than necessary. So a more advanced
         // implementation would be desirable for sub-microsecond delays.
-        let us = ns.div_ceil(1000);
+        let us = ns / 1000 + if ns % 1000 == 0 { 0 } else { 1 };
+        // With rustc 1.73, this can be replaced by:
+        // let us = ns.div_ceil(1000);
         self.delay_us_internal(us)
     }