Google on Tuesday said it will switch off Chrome security updates in under five months for about one-in-seven Windows users and around the same portion of those running Apple’s OS X.

As of April 2016, Google will stop patching known Chrome vulnerabilities on 2001’s Windows XP and 2007’s Windows Vista. Together the two operating systems powered 14.8% of all Windows PCs last month.

The browser won’t suddenly refuse to work, but fixes for security flaws, including those that may already be in a hacker’s toolkit, will not be offered to Windows XP and Vista customers. Once April arrives, users running those operating systems will not be served any Chrome updates, which often include not only bug fixes but also feature and functionality changes.

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