diff --git a/DnsServerCore/Dhcp/Options/VendorSpecificInformationOption.cs b/DnsServerCore/Dhcp/Options/VendorSpecificInformationOption.cs
index 21cc2c10..a9de2681 100644
--- a/DnsServerCore/Dhcp/Options/VendorSpecificInformationOption.cs
+++ b/DnsServerCore/Dhcp/Options/VendorSpecificInformationOption.cs
@@ -106,7 +106,7 @@ namespace DnsServerCore.Dhcp.Options
 
         public override string ToString()
         {
-            return Convert.ToHexString(_information);
+            return BitConverter.ToString(_information).Replace("-", ":");
         }
 
         #endregion