diff --git a/layout/reftests/transform-3d/reftest.list b/layout/reftests/transform-3d/reftest.list
index dc6df100f28..847cba5671c 100644
--- a/layout/reftests/transform-3d/reftest.list
+++ b/layout/reftests/transform-3d/reftest.list
@@ -35,3 +35,5 @@ fails == preserve3d-1a.html preserve3d-1-ref.html
== sorting-2a.html sorting-2-ref.html
# Parallel planes, same z depth (shouldn't be sorted!)
== sorting-2b.html sorting-2-ref.html
+# Different, but equivalent (for the given transform) transform origins
+== rotatex-transformorigin-1a.html rotatex-transformorigin-1-ref.html
diff --git a/layout/reftests/transform-3d/rotatex-transformorigin-1-ref.html b/layout/reftests/transform-3d/rotatex-transformorigin-1-ref.html
new file mode 100644
index 00000000000..11a2dcf2d0c
--- /dev/null
+++ b/layout/reftests/transform-3d/rotatex-transformorigin-1-ref.html
@@ -0,0 +1,11 @@
+
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diff --git a/layout/reftests/transform-3d/rotatex-transformorigin-1a.html b/layout/reftests/transform-3d/rotatex-transformorigin-1a.html
new file mode 100644
index 00000000000..2c54cef3260
--- /dev/null
+++ b/layout/reftests/transform-3d/rotatex-transformorigin-1a.html
@@ -0,0 +1,11 @@
+
+
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