At 9.10am, the local unit traded at 4.4480/4530 to the greenback from 4.4430/4460.
A dealer said the US dollar regained some lost ground after Federal Reserve Chair Janet Yellen suggested the central bank was ready to raise overnight interest rates quickly in the coming year.
The ringgit, however, traded higher against a basket of major currencies.
It appreciated against the Singapore dollar to 3.1111/1149 from 3.1267/1301 on Wednesday and strengthened against the British pound to 5.4515/4580 from 5.4724/4784.
The ringgit rose versus the euro to 4.7256/7326 from 4.7513/7563 and improved against the yen at 3.8749/8806 from 3.9228/9265.