diff --git a/gfx/2d/ScaledFontMac.h b/gfx/2d/ScaledFontMac.h
index c141f96b26cd..37e730d46c91 100644
--- a/gfx/2d/ScaledFontMac.h
+++ b/gfx/2d/ScaledFontMac.h
@@ -50,6 +50,7 @@ public:
 #endif
   virtual already_AddRefed<Path> GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget *aTarget);
   virtual bool GetFontFileData(FontFileDataOutput aDataCallback, void *aBaton);
+  virtual bool CanSerialize() override { return true; }
 
 #ifdef USE_CAIRO_SCALED_FONT
   cairo_font_face_t* GetCairoFontFace();
diff --git a/gfx/layers/wr/WebRenderBridgeParent.cpp b/gfx/layers/wr/WebRenderBridgeParent.cpp
index e41482076983..4f0f01c90539 100644
--- a/gfx/layers/wr/WebRenderBridgeParent.cpp
+++ b/gfx/layers/wr/WebRenderBridgeParent.cpp
@@ -359,13 +359,13 @@ WebRenderBridgeParent::ProcessWebrenderCommands(InfallibleTArray<WebRenderComman
         const OpDPPushText& op = cmd.get_OpDPPushText();
         const nsTArray<WrGlyphArray>& glyph_array = op.glyph_array();
 
+        // TODO: We are leaking the key
+        wr::FontKey fontKey;
+        auto slice = Range<uint8_t>(op.font_buffer().mData, op.font_buffer_length());
+        fontKey = mApi->AddRawFont(slice);
+
         for (size_t i = 0; i < glyph_array.Length(); i++) {
           const nsTArray<WrGlyphInstance>& glyphs = glyph_array[i].glyphs;
-
-          // TODO: We are leaking the key
-          wr::FontKey fontKey;
-          auto slice = Range<uint8_t>(op.font_buffer().mData, op.font_buffer_length());
-          fontKey = mApi->AddRawFont(slice);
           builder.PushText(op.bounds(),
                            op.clip(),
                            glyph_array[i].color,
diff --git a/gfx/layers/wr/WebRenderTextLayer.cpp b/gfx/layers/wr/WebRenderTextLayer.cpp
index bd229d3d7562..41bdf53e5947 100644
--- a/gfx/layers/wr/WebRenderTextLayer.cpp
+++ b/gfx/layers/wr/WebRenderTextLayer.cpp
@@ -16,9 +16,9 @@ namespace layers {
 using namespace mozilla::gfx;
 
 static void
-DWriteFontFileData(const uint8_t* aData, uint32_t aLength, uint32_t aIndex,
-                   float aGlyphSize, uint32_t aVariationCount,
-                   const ScaledFont::VariationSetting* aVariations, void* aBaton)
+WriteFontFileData(const uint8_t* aData, uint32_t aLength, uint32_t aIndex,
+                  float aGlyphSize, uint32_t aVariationCount,
+                  const ScaledFont::VariationSetting* aVariations, void* aBaton)
 {
     WebRenderTextLayer* layer = static_cast<WebRenderTextLayer*>(aBaton);
 
@@ -46,8 +46,9 @@ WebRenderTextLayer::RenderLayer()
       clip = rect;
     }
 
-    MOZ_ASSERT(mFont->GetType() == FontType::DWRITE);
-    mFont->GetFontFileData(&DWriteFontFileData, this);
+    MOZ_ASSERT((mFont->GetType() == FontType::DWRITE) ||
+                (mFont->GetType() == FontType::MAC));
+    mFont->GetFontFileData(&WriteFontFileData, this);
     wr::ByteBuffer fontBuffer(mFontDataLength, mFontData);
 
     nsTArray<WrGlyphArray> wr_glyphs;