The Brexit vote puts a drag on global IT spending, but the U.K. will see the worst impact, Gartner said in a new spending forecast.

Gartner had predicted a rise in U.K. tech spending by 1.7% this year, for a total spend of $179.6 billion in U.S. dollars. But this forecast was before Thursday’s decision by U.K. voters to leave the European Union.

The Brexit vote lowers the 2016 U.K. spending estimate between 2% and 5%, moving it into negative territory, said Gartner Friday. It expects U.K. IT spending to remain negative into next year.

The leading reason for the decline is summed up in one word by Gartner analyst John Lovelock: “Uncertainty.”

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