diff --git a/testing/web-platform/meta/media-source/mediasource-redundant-seek.html.ini b/testing/web-platform/meta/media-source/mediasource-redundant-seek.html.ini
index 395610280da0..f59748879de7 100644
--- a/testing/web-platform/meta/media-source/mediasource-redundant-seek.html.ini
+++ b/testing/web-platform/meta/media-source/mediasource-redundant-seek.html.ini
@@ -5,8 +5,5 @@
     if os == "mac": OK
     TIMEOUT
   [Test redundant fully prebuffered seek]
-    expected:
-      if (os == "win") and (version != "5.1.2600"): PASS
-      if os == "mac": PASS
-      TIMEOUT
+    disabled: https://bugzilla.mozilla.org/show_bug.cgi?id=1154881