diff --git a/src/libraries/System.Threading.Tasks.Parallel/tests/ParallelLoopResultTests.cs b/src/libraries/System.Threading.Tasks.Parallel/tests/ParallelLoopResultTests.cs
index 430eabdfa01bb..9006ee9469fc6 100644
--- a/src/libraries/System.Threading.Tasks.Parallel/tests/ParallelLoopResultTests.cs
+++ b/src/libraries/System.Threading.Tasks.Parallel/tests/ParallelLoopResultTests.cs
@@ -373,6 +373,7 @@ private static void OrderablePartitionerForEachPLRTest(
 
         // Perform tests on various combinations of Stop()/Break()
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/91579", typeof(PlatformDetection), nameof(PlatformDetection.IsWasmThreadingSupported))]
         public static void SimultaneousStopBreakTests()
         {
             //