Windows 95 Static IP Address

I have a Windows NT 4 network with Windows 2000 clients and a few Windows 95 clients. All clients use DHCP. I need to assign a static IP address to one Windows 95 client, but when I open the IP properties for the NIC and select “Specify an IP address” I cannot enter an address. In fact, the cursor does not blink in the IP address field. Is there a setting that I can change to fix this?