diff --git a/testsuite/render-microfacet/ref/out-optix-alt.exr b/testsuite/render-microfacet/ref/out-optix-alt.exr
index d6bc304bf..d8f25dda6 100644
Binary files a/testsuite/render-microfacet/ref/out-optix-alt.exr and b/testsuite/render-microfacet/ref/out-optix-alt.exr differ