--- a/gfx/thebes/gfxWindowsPlatform.cpp
+++ b/gfx/thebes/gfxWindowsPlatform.cpp
@@ -321,16 +321,17 @@ gfxWindowsPlatform::gfxWindowsPlatform()
   /*
    * Initialize COM
    */
   CoInitialize(nullptr);
 
   RegisterStrongMemoryReporter(new GfxD2DVramReporter());
   RegisterStrongMemoryReporter(new GPUAdapterReporter());
   RegisterStrongMemoryReporter(new D3DSharedTexturesReporter());
+  gfxDWriteFont::UpdateClearTypeUsage();
 }
 
 gfxWindowsPlatform::~gfxWindowsPlatform()
 {
   mozilla::gfx::Factory::D2DCleanup();
 
   DeviceManagerD3D9::Shutdown();
   DeviceManagerDx::Shutdown();