diff --git a/src/SourceBuild/content/repo-projects/Directory.Build.props b/src/SourceBuild/content/repo-projects/Directory.Build.props
index 4e1de0d90..fc55ef01e 100644
--- a/src/SourceBuild/content/repo-projects/Directory.Build.props
+++ b/src/SourceBuild/content/repo-projects/Directory.Build.props
@@ -61,7 +61,6 @@
     <EnvironmentVariables Include="DotNetPackageVersionPropsPath=$(PackageVersionPropsPath)" />
     <EnvironmentVariables Include="DotNetRestorePackagesPath=$(PackagesDir)" />
     <EnvironmentVariables Include="DotNetBuildOffline=true" />
-    <EnvironmentVariables Include="SuppressTfmSupportBuildWarnings=true" />
 
     <!-- Ensure the SDK (Core-SDK/Installer) doesn't add an online source. -->
     <EnvironmentVariables Include="AddDotnetfeedProjectSource=false" />
diff --git a/src/SourceBuild/content/repo-projects/roslyn.proj b/src/SourceBuild/content/repo-projects/roslyn.proj
index b67a113d9..2eb58c459 100644
--- a/src/SourceBuild/content/repo-projects/roslyn.proj
+++ b/src/SourceBuild/content/repo-projects/roslyn.proj
@@ -13,8 +13,6 @@
     <!-- issue: https://github.com/dotnet/source-build/issues/1719 -->
     <BuildCommandArgs>$(BuildCommandArgs) /p:UsingToolMicrosoftNetCompilers=false</BuildCommandArgs>
     <BuildCommandArgs>$(BuildCommandArgs) /p:RepoRoot=$(ProjectDirectory)</BuildCommandArgs>
-    <!-- Investigate how to remove this specialization for source-build: https://github.com/dotnet/source-build/issues/2889 -->
-    <BuildCommandArgs>$(BuildCommandArgs) /p:SuppressTfmSupportBuildWarnings=true</BuildCommandArgs>
 
     <BuildCommand>$(ProjectDirectory)build$(ShellExtension) $(BuildCommandArgs)</BuildCommand>