diff --git a/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs b/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs
index 6ce1540fba5996..884c18947568cb 100644
--- a/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs
+++ b/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicTests.cs
@@ -453,6 +453,7 @@ public BufferSegment Append(ReadOnlyMemory<byte> memory)
         }
 
         [Fact]
+        [OuterLoop("May take several seconds")]
         public async Task ByteMixingOrNativeAVE_MinimalFailingTest()
         {
             const int writeSize = 64 * 1024;