diff --git a/lib/core-complete.sh b/lib/core-complete.sh
index cd9d11db..29ec957f 100644
--- a/lib/core-complete.sh
+++ b/lib/core-complete.sh
@@ -4071,11 +4071,7 @@ function ble/complete/auto-complete.idle {
   [[ $_ble_edit_str ]] || return 0
 
   # bleopt_complete_auto_delay だけ経過してから処理
-  local rest_delay=$((bleopt_complete_auto_delay-ble_util_idle_elapsed))
-  if ((rest_delay>0)); then
-    ble/util/idle.sleep "$rest_delay"
-    return
-  fi
+  ble/util/idle.sleep-until $((_idle_clock_start+bleopt_complete_auto_delay)) checked && return 0
 
   ble/complete/auto-complete.impl
 }