diff --git a/ipset/def.sh b/ipset/def.sh
index 28e04aa..fe0512b 100644
--- a/ipset/def.sh
+++ b/ipset/def.sh
@@ -167,9 +167,7 @@ flush_dns_cache()
  fi
 
  # MacOS
- if exists pgrep && pgrep ^mDNSResponder$ >/dev/null; then
-  killall -HUP mDNSResponder
- fi
+ killall -HUP mDNSResponder 2>/dev/null
 }
 dnstest()
 {