diff --git a/libs/win32/ffmpeg/ffmpeg.2017.vcxproj b/libs/win32/ffmpeg/ffmpeg.2017.vcxproj
index 4c70bf6c71..3e80a43e7e 100644
--- a/libs/win32/ffmpeg/ffmpeg.2017.vcxproj
+++ b/libs/win32/ffmpeg/ffmpeg.2017.vcxproj
@@ -77,7 +77,7 @@
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     <ClCompile>
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+      <PreprocessorDefinitions>_UCRT_NOISY_NAN;WC_ERR_INVALID_CHARS=0x00000080;BUILDING_avdevice;BUILDING_avfilter;BUILDING_avformat;BUILDING_avcodec;BUILDING_swresample;BUILDING_swscale;BUILDING_avutil;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug-x264|x64'">