diff --git a/src/libraries/System.IO.FileSystem/tests/FileStream/SafeFileHandle.cs b/src/libraries/System.IO.FileSystem/tests/FileStream/SafeFileHandle.cs
index 209ddf0c4a587..04773b5a8df72 100644
--- a/src/libraries/System.IO.FileSystem/tests/FileStream/SafeFileHandle.cs
+++ b/src/libraries/System.IO.FileSystem/tests/FileStream/SafeFileHandle.cs
@@ -64,7 +64,7 @@ public async Task ThrowWhenHandlePositionIsChanged_sync()
             await ThrowWhenHandlePositionIsChanged(useAsync: false);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         public async Task ThrowWhenHandlePositionIsChanged_async()
         {
             await ThrowWhenHandlePositionIsChanged(useAsync: true);