diff --git a/src/SourceBuild/content/repo-projects/Directory.Build.props b/src/SourceBuild/content/repo-projects/Directory.Build.props
index d4d3f3aeb..4daaf1eb2 100644
--- a/src/SourceBuild/content/repo-projects/Directory.Build.props
+++ b/src/SourceBuild/content/repo-projects/Directory.Build.props
@@ -165,6 +165,7 @@
     <StandardSourceBuildArgs>$(StandardSourceBuildArgs) /p:PreviouslySourceBuiltNupkgCacheDir="$(PrebuiltSourceBuiltPackagesPath)"</StandardSourceBuildArgs>
     <StandardSourceBuildArgs>$(StandardSourceBuildArgs) /p:SourceBuildUseMonoRuntime=$(SourceBuildUseMonoRuntime)</StandardSourceBuildArgs>
     <StandardSourceBuildArgs>$(StandardSourceBuildArgs) /p:DotNetBuildVertical=$(DotNetBuildVertical)</StandardSourceBuildArgs>
+    <StandardSourceBuildArgs>$(StandardSourceBuildArgs) /p:CrossBuild=$(CrossBuild)</StandardSourceBuildArgs>
 
     <StandardSourceBuildCommand>$(ProjectDirectory)\build$(ShellExtension)</StandardSourceBuildCommand>
   </PropertyGroup>