diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
index 7f95d69..d8227f9 100644
--- a/LayoutTests/ChangeLog
+++ b/LayoutTests/ChangeLog
@@ -1,3 +1,12 @@
+2020-04-01  Jason Lawrence  <lawrence.j@apple.com>
+
+        [ Mojave wk1 Release ] platform/mac/media/media-source/videoplaybackquality-decompressionsession.html is flaky failing.
+        https://bugs.webkit.org/show_bug.cgi?id=209866
+
+        Unreviewed test gardening.
+
+        * platform/mac-wk1/TestExpectations:
+
 2020-04-01  Commit Queue  <commit-queue@webkit.org>
 
         Unreviewed, reverting r259328.
diff --git a/LayoutTests/platform/mac-wk1/TestExpectations b/LayoutTests/platform/mac-wk1/TestExpectations
index 1a18ac7..b607c2e 100644
--- a/LayoutTests/platform/mac-wk1/TestExpectations
+++ b/LayoutTests/platform/mac-wk1/TestExpectations
@@ -946,4 +946,6 @@
 
 webkit.org/b/209621 fast/loader/child-frame-add-after-back-forward.html [ Pass Timeout ]
 
-webkit.org/b/209837 [ Mojave Release ] fast/canvas/webgl/texImage2D-mse-flipY-true.html [ Pass Timeout ]
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+webkit.org/b/209837 [ Mojave Release ] fast/canvas/webgl/texImage2D-mse-flipY-true.html [ Pass Timeout ]
+
+webkit.org/b/209866 [ Mojave Release ] platform/mac/media/media-source/videoplaybackquality-decompressionsession.html [ Pass Failure ]
\ No newline at end of file