# C++ header files from a previous version of visual studio?

**URL:** <https://forums.unrealengine.com/t/c-header-files-from-a-previous-version-of-visual-studio/358138>\
**Category:** Platform & Builds\
**Tags:** header, build, unreal-engine, update, CPP, question\
**Created:** [May 21, 2016, 7:14pm UTC](https://forums.unrealengine.com/t/c-header-files-from-a-previous-version-of-visual-studio/358138 "2016-05-21T19:14:15Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Jamie\_Dale](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jamie_dale/32/1165413_2.png) [@Jamie\_Dale](https://forums.unrealengine.com/u/Jamie_Dale)\
**Post date:** [May 21, 2016, 9:33pm UTC](https://forums.unrealengine.com/t/c-header-files-from-a-previous-version-of-visual-studio/358138/7 "2016-05-21T21:33:53Z")

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You’ll need to clean before building after upgrading Visual Studio. Right click on your solution and choose “Clean” and then build as normal.

If that still doesn’t work, delete your projects Intermediate/Build folder, re-generate project files for it, and try again.

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