TCP VPN DNS leaks

I got an eg.ovpn over tcp from Free OpenVPN - Free VPN access with no restrictions! on Whonix-Ubuntu-Workstation and run it with command openvpn eg.ovpn. Checking my IP address online shows my ip address is now changed to the VPN service provider but I am leaking DNS which shows TOR service provider’s DNS address. Is there a way to prevent the DNS leaks?