diff --git a/Directory.Build.targets b/Directory.Build.targets
index 04bef13..1a8c992 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -51,4 +51,29 @@
   <ItemGroup>
     <InternalsVisibleTo Update="@(InternalsVisibleTo)" Condition="'$(SignType)' == 'Test' Or '$(SignType)' == 'Real'" Key="002400000480000094000000060200000024000052534131000400000100010015c01ae1f50e8cc09ba9eac9147cf8fd9fce2cfe9f8dce4f7301c4132ca9fb50ce8cbf1df4dc18dd4d210e4345c744ecb3365ed327efdbc52603faa5e21daa11234c8c4a73e51f03bf192544581ebe107adee3a34928e39d04e524a9ce729d5090bfd7dad9d10c722c0def9ccc08ff0a03790e48bcd1f9b6c476063e1966a1c4" />
   </ItemGroup>
+
+    <!-- BEGIN workaround for https://github.com/dotnet/sdk/issues/43339; remove after updated to VS 17.12 or a future 17.11 patch -->
+    <Target Name="WorkaroundDotnetSdk43339" BeforeTargets="ResolvePackageAssets" Condition=" '$(MSBuildRuntimeType)' == 'Full' and $([MSBuild]::VersionLessThan($(MSBuildVersion), 17.12.0))">
+      <PrimeSystemTextJson804 />
+    </Target>
+    <UsingTask
+      TaskName="PrimeSystemTextJson804"
+      TaskFactory="RoslynCodeTaskFactory"
+      AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll" >
+      <Task>
+        <Code Type="Fragment" Language="cs">
+  <![CDATA[
+  try
+  {
+      System.Reflection.Assembly.LoadFrom(@"$(MicrosoftNETBuildTasksDirectoryRoot)\..\..\..\DotnetTools\dotnet-format\BuildHost-net472\System.Text.Json.dll");
+  }
+  catch
+  {
+      // Best effort: if something moves in the SDK don't break the build.
+  }
+  ]]>
+        </Code>
+      </Task>
+    </UsingTask>
+    <!-- END workaround for https://github.com/dotnet/sdk/issues/43339 -->
 </Project>