diff --git a/nagios/files/commands.cfg b/nagios/files/commands.cfg
index 7ce55eb..d84bcf4 100644
--- a/nagios/files/commands.cfg
+++ b/nagios/files/commands.cfg
@@ -55,7 +55,7 @@ define command{
 # 'check-host-alive' command definition
 define command{
         command_name    check-host-alive
-        command_line    $USER1$/check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5
+        command_line    $USER1$/check_ping -4 -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5
         }