diff --git a/qemu-timer.c b/qemu-timer.c
index 4441fe66fffb0536b9fef765affdf1f188e210dc..eb22e9218bc06f885b922acf543056358663e281 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -292,7 +292,7 @@ int qemu_timeout_ns_to_ms(int64_t ns)
     /* Always round up, because it's better to wait too long than to wait too
      * little and effectively busy-wait
      */
-    ms = (ns + SCALE_MS - 1) / SCALE_MS;
+    ms = DIV_ROUND_UP(ns, SCALE_MS);
 
     /* To avoid overflow problems, limit this to 2^31, i.e. approx 25 days */
     if (ms > (int64_t) INT32_MAX) {