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DS90UB924-Q1: DS90UB924-Q1 I2C pull up

Part Number: DS90UB924-Q1

Tool/software:

Hi guys

I have a question regarding a pull up voltage on I2C lines for the DS90UB924-Q1.

VDDIO of the DS90UB924-Q1 connected to 1.8V, and I2C lines (sda,scl) connected to the bank of FPGA which is also 1.8V.

I assume that the pullups (for the sda,scl) should be connected to the 1.8V, but in the datasheet written to connect to 3.3V. 

What should I do?

Regards

Dany