diff --git a/src/Tasks/ResolveNonMSBuildProjectOutput.cs b/src/Tasks/ResolveNonMSBuildProjectOutput.cs
index 6667c4bb082..e73dac472b0 100644
--- a/src/Tasks/ResolveNonMSBuildProjectOutput.cs
+++ b/src/Tasks/ResolveNonMSBuildProjectOutput.cs
@@ -22,6 +22,7 @@ namespace Microsoft.Build.Tasks
     /// references (i.e. calling into specific targets of references to get the manifest file name)
     /// which would not be possible with a mixed list of MSBuild and non-MSBuild references.
     /// </remarks>
+    [MSBuildMultiThreadableTask]
     public class ResolveNonMSBuildProjectOutput : ResolveProjectBase
     {
         #region Constructors