diff --git a/core/fpdfapi/render/cpdf_rendertiling.cpp b/core/fpdfapi/render/cpdf_rendertiling.cpp
index 2e0fc88..571ffb2 100644
--- a/core/fpdfapi/render/cpdf_rendertiling.cpp
+++ b/core/fpdfapi/render/cpdf_rendertiling.cpp
@@ -37,7 +37,8 @@
     return nullptr;
   }
   CFX_DefaultRenderDevice bitmap_device;
-  bitmap_device.Attach(pBitmap, false, nullptr, false);
+  bitmap_device.Attach(pBitmap, /*bRgbByteOrder=*/false,
+                       /*pBackdropBitmap=*/nullptr, /*bGroupKnockout=*/true);
   pBitmap->Clear(0);
   CFX_FloatRect cell_bbox =
       pPattern->pattern_to_form().TransformRect(pPattern->bbox());
diff --git a/testing/SUPPRESSIONS b/testing/SUPPRESSIONS
index 6903a24..b697dcc 100644
--- a/testing/SUPPRESSIONS
+++ b/testing/SUPPRESSIONS
@@ -330,9 +330,6 @@
 # TODO(pdfium:1747): Remove after associated bug is fixed
 bug_1258634.in * * * skia
 
-# TODO(pdfium:1748): Remove after associated bug is fixed
-bug_1286.in * * * skia
-
 # TODO(pdfium:1331): Remove after associated bug is fixed
 bug_1331.in * * * *