diff --git a/util.c b/util.c
index dd0d570..166c70f 100644
--- a/util.c
+++ b/util.c
@@ -93,7 +93,8 @@ void normalize_timespec(struct timespec *ts)
 void get_deadline(uint32_t timeout_ms, struct timespec *ts)
 {
     clock_gettime(CLOCK_REALTIME, ts);
-    ts->tv_nsec += timeout_ms * 1000000;
+    ts->tv_sec += timeout_ms / 1000;
+    ts->tv_nsec += (timeout_ms % 1000) * 1000000;
     normalize_timespec(ts);
 }