diff --git a/xCAT-server/share/xcat/tools/detect_dhcpd b/xCAT-server/share/xcat/tools/detect_dhcpd
index d696a66eb..e7361fdda 100755
--- a/xCAT-server/share/xcat/tools/detect_dhcpd
+++ b/xCAT-server/share/xcat/tools/detect_dhcpd
@@ -313,3 +313,4 @@ sub kill_child {
     #print "try to kill $cpid\n";
   }
 }
+