Conditional Formatting using Data Bars giving me Relative Reference Error

i have data in two columns, C actual results and D what was planned. I want a bar in cell C (With the Data) showing how close we were to plan. I was using the conditional format\data bars. I selected RULE: format cell based on values STYLE: Data bars MIN TYPE: Number = 0 MAX TYPE: Number = $D$2. This will work for row 2, so i change $D$2 to $D2, and hit okay, but excel give me an error. I have a work around, but I lose showing the data in column C. Is there another way to make excel do what I want it to other than conditionally formatting each cell interdependently?

C D
2 4
3 4
6000 8000



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thanks so much for you help in advance.