diff --git a/src/main.go b/src/main.go
index 81361c0..cc74fb3 100644
--- a/src/main.go
+++ b/src/main.go
@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"log"
-	"net"
 	"net/http"
 	"net/url"
 	"os"
@@ -37,12 +36,7 @@ func main() {
 	}
 
 	for iface_indx, iface := range config.Interfaces {
-		var ping_param string = "-S " // default ping ip
-		if net.ParseIP(iface.IpOrInterfaceName) == nil {
-			ping_param = "-I "
-		} // ping interface
-
-		pingResult := ping("-w " + fmt.Sprint(config.WaitTimeSec) + " " + ping_param + iface.IpOrInterfaceName + " " + config.PingAddr)
+		pingResult := ping("-w " + fmt.Sprint(config.WaitTimeSec) + " -I " + iface.IpOrInterfaceName + " " + config.PingAddr)
 
 		pingable = append(pingable, PingData{iface.IpOrInterfaceName, pingResult, time.Now()})