diff --git a/eng/versioning.targets b/eng/versioning.targets
index 468f236c5f4827..e6a3e7d1f0ad76 100644
--- a/eng/versioning.targets
+++ b/eng/versioning.targets
@@ -20,6 +20,9 @@
     <AssemblyMetadata Include="PreferInbox">
       <Value>True</Value>
     </AssemblyMetadata>
+    <AssemblyMetadata Include="IsTrimmable" Condition="'$(SetIsTrimmable)' != 'false'">
+      <Value>True</Value>
+    </AssemblyMetadata>
   </ItemGroup>
 
   <!-- Adds SupportedOSPlatform attribute for Windows Specific libraries -->
@@ -83,7 +86,7 @@
       </AssemblyAttribute>
 
       <AssemblyAttribute Include="System.Reflection.AssemblyMetadata"
-                         Condition="'$(SkipFrameworkAssemblyMetadata)' != 'true' and '@(AssemblyMetadata)' != ''">
+                         Condition="'@(AssemblyMetadata)' != ''">
         <_Parameter1>%(AssemblyMetadata.Identity)</_Parameter1>
         <_Parameter2>%(AssemblyMetadata.Value)</_Parameter2>
       </AssemblyAttribute>
diff --git a/src/libraries/System.Private.CoreLib/src/Internal/AssemblyAttributes.cs b/src/libraries/System.Private.CoreLib/src/Internal/AssemblyAttributes.cs
index 0052cefef04f14..3c0b9479941cee 100644
--- a/src/libraries/System.Private.CoreLib/src/Internal/AssemblyAttributes.cs
+++ b/src/libraries/System.Private.CoreLib/src/Internal/AssemblyAttributes.cs
@@ -22,5 +22,6 @@
 
 [assembly: AssemblyMetadata("Serviceable", "True")]
 [assembly: AssemblyMetadata(".NETFrameworkAssembly", "")]
+[assembly: AssemblyMetadata("IsTrimmable", "True")]
 
 [assembly: NeutralResourcesLanguage("en-US")]