diff --git a/eng/SourceBuild.props b/eng/SourceBuild.props
index 1dfe97fe1ca605..c4c76b265e034c 100644
--- a/eng/SourceBuild.props
+++ b/eng/SourceBuild.props
@@ -49,6 +49,7 @@
       <InnerBuildArgs>$(InnerBuildArgs) /p:EnableNgenOptimization=false</InnerBuildArgs>
       <InnerBuildArgs>$(InnerBuildArgs) /p:AdditionalRuntimeIdentifierParent=$(BaseOS)</InnerBuildArgs>
       <InnerBuildArgs>$(InnerBuildArgs) /p:EnablePackageValidation=false</InnerBuildArgs>
+      <InnerBuildArgs Condition="'$(SourceBuildUseMonoRuntime)' == 'true'">$(InnerBuildArgs) /p:PrimaryRuntimeFlavor=Mono /p:RuntimeFlavor=Mono</InnerBuildArgs>
     </PropertyGroup>
   </Target>