diff --git a/src/libraries/tests.proj b/src/libraries/tests.proj
index fbd5181e915611..3938a299615c2f 100644
--- a/src/libraries/tests.proj
+++ b/src/libraries/tests.proj
@@ -59,7 +59,6 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Resources.Reader\tests\System.Resources.Reader.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Resources.ResourceManager\tests\System.Resources.ResourceManager.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.Loader\tests\System.Runtime.Loader.Tests.csproj" />
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime.Serialization.Primitives\tests\System.Runtime.Serialization.Primitives.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Runtime\tests\System.Runtime.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Security.Permissions\tests\System.Security.Permissions.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.RegularExpressions\tests\System.Text.RegularExpressions.Tests.csproj" />