diff --git a/src/libraries/Microsoft.Extensions.Diagnostics/ref/Microsoft.Extensions.Diagnostics.csproj b/src/libraries/Microsoft.Extensions.Diagnostics/ref/Microsoft.Extensions.Diagnostics.csproj
index 547f7c29a0d8a1..2dbcc3c5ac7b62 100644
--- a/src/libraries/Microsoft.Extensions.Diagnostics/ref/Microsoft.Extensions.Diagnostics.csproj
+++ b/src/libraries/Microsoft.Extensions.Diagnostics/ref/Microsoft.Extensions.Diagnostics.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
-    <CLSCompliant>false</CLSCompliant>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Diagnostics/src/Microsoft.Extensions.Diagnostics.csproj b/src/libraries/Microsoft.Extensions.Diagnostics/src/Microsoft.Extensions.Diagnostics.csproj
index e3e9882541ed73..7a879044946db4 100644
--- a/src/libraries/Microsoft.Extensions.Diagnostics/src/Microsoft.Extensions.Diagnostics.csproj
+++ b/src/libraries/Microsoft.Extensions.Diagnostics/src/Microsoft.Extensions.Diagnostics.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
     <EnableDefaultItems>true</EnableDefaultItems>
-    <CLSCompliant>false</CLSCompliant>
     <!-- Disabling baseline validation since this is a brand new package.
        Once this package has shipped a stable version, the following line
        should be removed in order to re-enable validation. -->
diff --git a/src/libraries/Microsoft.Extensions.Diagnostics/tests/Microsoft.Extensions.Diagnostics.Tests.csproj b/src/libraries/Microsoft.Extensions.Diagnostics/tests/Microsoft.Extensions.Diagnostics.Tests.csproj
index 7c5a5938295d93..31b45c09024daa 100644
--- a/src/libraries/Microsoft.Extensions.Diagnostics/tests/Microsoft.Extensions.Diagnostics.Tests.csproj
+++ b/src/libraries/Microsoft.Extensions.Diagnostics/tests/Microsoft.Extensions.Diagnostics.Tests.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetFrameworkMinimum)</TargetFrameworks>
     <EnableDefaultItems>true</EnableDefaultItems>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <CLSCompliant>false</CLSCompliant>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj
index d33e1fc8e2dddf..322bb71dc3f6c1 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
-    <CLSCompliant>false</CLSCompliant>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
index f8d7e876857f4f..24a23478b7c0c2 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <CLSCompliant>false</CLSCompliant>
     <NoWarn>$(NoWarn);SA1205</NoWarn>
     <EnableTrimAnalyzer Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) == '.NETFramework'">false</EnableTrimAnalyzer>
     <IsPackable>true</IsPackable>