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Editorial Team
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Asked: 2026-06-12T22:53:38+00:00

_WIN32_WINNT not defined. Defaulting to _WIN32_WINNT_MAXVER (see WinSDKVer.h) This error keeps popping up during

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_WIN32_WINNT not defined. Defaulting to _WIN32_WINNT_MAXVER (see WinSDKVer.h)

This error keeps popping up during my compilation. It doesn’t seem to affect compilation, but how should I get rid of it? Am I risking anything by ignoring it?

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  1. Editorial Team

    It is defined for you through WinSDKVer.h. So just define it explicitly on the top of your source code (e.g. in the beginning of stdafx.h) and you will get rid of the warning.

    Having it defined to the same value (as compared to _WIN32_WINNT_MAXVER from WinSDKVer.h) is highly unlikely to break anything.

    For example, WinSDKVer.h of Windows® Software Development Kit (SDK) for Windows 7 and .NET Framework 3.5 Service Pack 1 contains:

    // This list contains the highest version constants supported by content 
// in the Windows SDK.

// [...]
#define _WIN32_WINNT_MAXVER     0x0601
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