diff --git a/src/libraries/Microsoft.Extensions.Caching.Memory/tests/MemoryCacheSetAndRemoveTests.cs b/src/libraries/Microsoft.Extensions.Caching.Memory/tests/MemoryCacheSetAndRemoveTests.cs
index e9e7fb4ebfc552..fb15d9732061e2 100644
--- a/src/libraries/Microsoft.Extensions.Caching.Memory/tests/MemoryCacheSetAndRemoveTests.cs
+++ b/src/libraries/Microsoft.Extensions.Caching.Memory/tests/MemoryCacheSetAndRemoveTests.cs
@@ -594,6 +594,7 @@ public void OvercapacityPurge_AreThreadSafe()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/33993")]
         public void AddAndReplaceEntries_AreThreadSafe()
         {
             var cache = new MemoryCache(new MemoryCacheOptions