--- a/eng/SourceBuild.props
+++ b/eng/SourceBuild.props
@@ -8,6 +8,7 @@
   <Target Name="ConfigureInnerBuildArg" BeforeTargets="GetSourceBuildCommandConfiguration">
     <PropertyGroup>
       <InnerBuildArgs>$(InnerBuildArgs) /p:Projects="$(InnerSourceBuildRepoRoot)\source-build.slnf"</InnerBuildArgs>
+      <InnerBuildArgs>$(InnerBuildArgs) /p:EnablePreviewFeatures=true</InnerBuildArgs>
     </PropertyGroup>
   </Target>