At 2200 GMT, the Aussie was at 101.34 US cents, well up on its 99.42 cents close locally on Wednesday.
"It's primarily the rescheduling of the vote in Slovakia and a weaker US dollar," ANZ Banking Group senior dealer Alex Sinton said.
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It follows Slovak parties agreeing to hold a new vote this week on revamping the eurozone's debt rescue fund.
Under pressure from European partners to vote again, a day after its parliament rejected an overhaul of the European Financial Stability Facility, four key parties struck a deal to adopt it in a second roll call by Friday.
The Aussie briefly edged above parity on Tuesday for the first time since September 22, but soon slipped back.
The risk-based currency first breached parity in October last year, hitting a record 110.81 US cents in July.
