diff --git a/dotnet/targets/Microsoft.Sdk.R2R.targets b/dotnet/targets/Microsoft.Sdk.R2R.targets
index 5db954f9fd45..3e6b49ad294f 100644
--- a/dotnet/targets/Microsoft.Sdk.R2R.targets
+++ b/dotnet/targets/Microsoft.Sdk.R2R.targets
@@ -128,6 +128,7 @@
 				Condition="'%(_ResolvedAssembliesToPublish.NuGetPackageId)' != ''" />
 			<_UserAssemblies Include="@(_ResolvedAssembliesToPublish)" Exclude="@(_NonUserAssemblies)" />
 			<PublishReadyToRunExclude Include="@(_UserAssemblies -> '%(Filename)%(Extension)')" />
+			<PublishReadyToRunCompositeRoots Include="System.Private.CoreLib.dll" KeepDuplicates="false" />
 		</ItemGroup>
 
 		<!-- Hash the R2R input assemblies so we can detect when the set actually changes -->
@@ -152,6 +153,14 @@
 		</ItemGroup>
 	</Target>
 
+	<Target Name="_DedupUnrootedReadyToRunPublish"
+			Condition="@(PublishReadyToRunCompositeRoots->Count()) != 0"
+			AfterTargets="_PrepareForReadyToRunCompilation">
+		<ItemGroup>
+			<ResolvedFileToPublish Remove="@(_ReadyToRunCompositeUnrootedBuildInput)" />
+		</ItemGroup>
+	</Target>
+
 	<!-- Touch R2R outputs when only user assemblies changed. If hash file is older than trigger, hash didn't change, so touch outputs to skip R2R -->
 	<Target Name="_TouchR2ROutputs"
 			Condition="'$(FilterReadyToRunAssemblies)' == 'true' And Exists('$(_R2RInputHashFile)') And Exists('$(_R2RInputHashFile).trigger') And $([System.IO.File]::GetLastWriteTime('$(_R2RInputHashFile)').Ticks) &lt; $([System.IO.File]::GetLastWriteTime('$(_R2RInputHashFile).trigger').Ticks)"