diff --git a/testsuite/render-microfacet/ref/out-macarmcpp-alt.exr b/testsuite/render-microfacet/ref/out-macarmcpp-alt.exr new file mode 100644 index 000000000..96c26124e Binary files /dev/null and b/testsuite/render-microfacet/ref/out-macarmcpp-alt.exr differ