diff --git a/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/sdk/Sdk.props b/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/sdk/Sdk.props
index 95af489da45b4..4f05d509f5cfc 100644
--- a/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/sdk/Sdk.props
+++ b/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/sdk/Sdk.props
@@ -14,4 +14,9 @@ Copyright (c) .NET Foundation. All rights reserved.
 
   <Import Project="Sdk.props" Sdk="Microsoft.NET.Sdk" />
 
+  <PropertyGroup>
+    <!-- By default the SDK produces ref assembly for 5.0 or later -->
+    <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
+  </PropertyGroup>
+
 </Project>
diff --git a/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/targets/Microsoft.NET.Sdk.IL.targets b/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/targets/Microsoft.NET.Sdk.IL.targets
index 8ca2c087e39a6..9206ec89a97b4 100644
--- a/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/targets/Microsoft.NET.Sdk.IL.targets
+++ b/src/coreclr/.nuget/Microsoft.NET.Sdk.IL/targets/Microsoft.NET.Sdk.IL.targets
@@ -27,16 +27,7 @@ Copyright (c) .NET Foundation. All rights reserved.
   </ItemGroup>
 
   <PropertyGroup>
-    <_OSPlatform Condition="$([MSBuild]::IsOSPlatform('windows'))">win</_OSPlatform>
-    <_OSPlatform Condition="$([MSBuild]::IsOSPlatform('linux'))">linux</_OSPlatform>
-    <_OSPlatform Condition="$([MSBuild]::IsOSPlatform('osx'))">osx</_OSPlatform>
-    <_OSPlatform Condition="$([MSBuild]::IsOSPlatform('freebsd'))">freebsd</_OSPlatform>
-    <_OSPlatform Condition="$([MSBuild]::IsOSPlatform('netbsd'))">netbsd</_OSPlatform>
-    <_OSPlatform Condition="$([MSBuild]::IsOSPlatform('illumos'))">illumos</_OSPlatform>
-    <_OSPlatform Condition="$([MSBuild]::IsOSPlatform('solaris'))">solaris</_OSPlatform>
-    <_OSArchitecture>$([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture)</_OSArchitecture>
-
-    <MicrosoftNetCoreIlasmPackageRuntimeId Condition="'$(MicrosoftNetCoreIlasmPackageRuntimeId)' == ''">$(_OSPlatform)-$(_OSArchitecture.ToLower())</MicrosoftNetCoreIlasmPackageRuntimeId>
+    <MicrosoftNetCoreIlasmPackageRuntimeId Condition="'$(MicrosoftNetCoreIlasmPackageRuntimeId)' == ''">$(NETCoreSdkPortableRuntimeIdentifier)</MicrosoftNetCoreIlasmPackageRuntimeId>
     <MicrosoftNETCoreILAsmVersion Condition="'$(MicrosoftNETCoreILAsmVersion)' == ''">6.0.0</MicrosoftNETCoreILAsmVersion>
     <MicrosoftNetCoreIlasmPackageName>runtime.$(MicrosoftNetCoreIlasmPackageRuntimeId).microsoft.netcore.ilasm</MicrosoftNetCoreIlasmPackageName>
     <MicrosoftNetCoreIldasmPackageName>runtime.$(MicrosoftNetCoreIlasmPackageRuntimeId).microsoft.netcore.ildasm</MicrosoftNetCoreIldasmPackageName>