diff --git a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
index 25b31b223fe16f..e7a4d652f848f9 100644
--- a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
+++ b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
@@ -219,9 +219,9 @@ Copyright (c) .NET Foundation. All rights reserved.
       <TrimmerSingleWarn Condition=" '$(TrimmerSingleWarn)' == '' ">true</TrimmerSingleWarn>
     </PropertyGroup>
 
-    <!-- Root the main assembly entry point. -->
+    <!-- Root the main assembly entry point for non-library projects. -->
     <ItemGroup>
-      <TrimmerRootAssembly Include="@(IntermediateAssembly->'%(Filename)')" RootMode="EntryPoint" />
+      <TrimmerRootAssembly Include="@(IntermediateAssembly->'%(Filename)')" RootMode="EntryPoint" Condition="'$(OutputType)' != 'Library'" />
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/tools/illink/test/ILLink.Tasks.Tests/MicrosoftNETILLinkTargetsTests.cs b/src/tools/illink/test/ILLink.Tasks.Tests/MicrosoftNETILLinkTargetsTests.cs
new file mode 100644
index 00000000000000..2507dc74885c66
--- /dev/null
+++ b/src/tools/illink/test/ILLink.Tasks.Tests/MicrosoftNETILLinkTargetsTests.cs
@@ -0,0 +1,49 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+using System.IO;
+using System.Linq;
+using System.Xml.Linq;
+using Xunit;
+
+#nullable enable
+
+namespace ILLink.Tasks.Tests
+{
+    public class MicrosoftNETILLinkTargetsTests
+    {
+        [Fact]
+        public void EntryPointRootIsNotAddedForLibraryProjects()
+        {
+            XDocument targets = XDocument.Load(GetTargetsFilePath());
+
+            XElement entryPointRoot = targets.Descendants()
+                .Where(element => element.Name.LocalName == "TrimmerRootAssembly")
+                .Single(element =>
+                    GetAttributeValue(element, "Include") == "@(IntermediateAssembly->'%(Filename)')" &&
+                    GetAttributeValue(element, "RootMode") == "EntryPoint");
+
+            Assert.Equal("'$(OutputType)' != 'Library'", GetAttributeValue(entryPointRoot, "Condition"));
+        }
+
+        private static string GetTargetsFilePath()
+        {
+            DirectoryInfo? directory = new DirectoryInfo(AppContext.BaseDirectory);
+
+            while (directory is not null)
+            {
+                string targetsFilePath = Path.Combine(directory.FullName, "src", "tools", "illink", "src", "ILLink.Tasks", "build", "Microsoft.NET.ILLink.targets");
+                if (File.Exists(targetsFilePath))
+                    return targetsFilePath;
+
+                directory = directory.Parent;
+            }
+
+            throw new FileNotFoundException("Could not locate Microsoft.NET.ILLink.targets.");
+        }
+
+        private static string GetAttributeValue(XElement element, string attributeName)
+            => element.Attribute(attributeName)?.Value ?? throw new InvalidDataException($"Missing '{attributeName}' attribute.");
+    }
+}