diff --git a/src/SourceBuild/tarball/content/repos/Directory.Build.targets b/src/SourceBuild/tarball/content/repos/Directory.Build.targets
index 9a61647b4..7bf88fdd6 100644
--- a/src/SourceBuild/tarball/content/repos/Directory.Build.targets
+++ b/src/SourceBuild/tarball/content/repos/Directory.Build.targets
@@ -85,11 +85,11 @@
       NewText="/p:RepoRoot="$repo_root/"" />
   </Target>
 
-  <Target Name="AddCommonNoWarns"
+  <Target Name="AddNoWarns"
           BeforeTargets="Build"
           Condition=" EXISTS('$(ProjectDirectory)Directory.Build.props') OR EXISTS('$(ProjectDirectory)src/Directory.Build.props') "
           Inputs="$(MSBuildProjectFullPath)"
-          Outputs="$(RepoCompletedSemaphorePath)AddCommonNoWarns.complete" >
+          Outputs="$(RepoCompletedSemaphorePath)AddNoWarns.complete" >
 
     <!-- Don't warn on warnings that can be generated in source-build
          but not necessarily in repo builds. 
@@ -104,7 +104,7 @@
       <OldText><![CDATA[</Project>]]></OldText>
       <NewText>
         <![CDATA[  <PropertyGroup>
-    <NoWarn>%24(NoWarn);NU5104;NU1603</NoWarn>
+    <NoWarn>%24(NoWarn);NU5104;NU1603;$(RepoNoWarns)</NoWarn>
   </PropertyGroup>
 </Project>]]>
       </NewText>
diff --git a/src/SourceBuild/tarball/content/repos/format.proj b/src/SourceBuild/tarball/content/repos/format.proj
index 9b57876c2..22de69468 100644
--- a/src/SourceBuild/tarball/content/repos/format.proj
+++ b/src/SourceBuild/tarball/content/repos/format.proj
@@ -7,6 +7,7 @@
     <GlobalJsonFile>$(ProjectDirectory)global.json</GlobalJsonFile>
     <NuGetConfigFile>$(ProjectDirectory)NuGet.config</NuGetConfigFile>
     <OutputPlacementRepoApiImplemented>false</OutputPlacementRepoApiImplemented>
+    <RepoNoWarns>CS9057</RepoNoWarns>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/SourceBuild/tarball/content/repos/installer.proj b/src/SourceBuild/tarball/content/repos/installer.proj
index f6803f4cf..f01668bba 100644
--- a/src/SourceBuild/tarball/content/repos/installer.proj
+++ b/src/SourceBuild/tarball/content/repos/installer.proj
@@ -46,6 +46,8 @@
 
     <!-- This repo uses text-only template packages from the internal transport feed. -->
     <SetUpInternalTransportFeed>true</SetUpInternalTransportFeed>
+
+    <RepoNoWarns>CS9057</RepoNoWarns>
   </PropertyGroup>
 
   <ItemGroup>