diff --git a/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets b/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
index 108c5c25bd63..8e9143bbe0fa 100644
--- a/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
+++ b/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
@@ -279,9 +279,11 @@ Copyright (c) .NET Foundation. All rights reserved.
       <ManagedAssemblyToLink Include="@(_TrimmableManagedAssemblyToLink)" IsTrimmable="true" />
     </ItemGroup>
 
-    <!-- Root the main assembly entry point. -->
     <ItemGroup>
-      <TrimmerRootAssembly Include="@(IntermediateAssembly)" RootMode="EntryPoint" />
+      <!-- Root the main assembly entry point. -->
+      <TrimmerRootAssembly Condition="'$(OutputType)' == 'Exe'" Include="@(IntermediateAssembly)" RootMode="EntryPoint" />
+      <!-- Or the entire assembly, for non-exe projects. -->
+      <TrimmerRootAssembly Condition="'$(OutputType)' != 'Exe'" Include="@(IntermediateAssembly)" RootMode="All" />
     </ItemGroup>
 
     <!-- For .NET < 6, root and copy assemblies without IsTrimmable=true MSBuild metadata. -->