diff --git a/gfx/layers/opengl/MacIOSurfaceTextureHostOGL.cpp b/gfx/layers/opengl/MacIOSurfaceTextureHostOGL.cpp
index 0ee16eb0e9bb..ff10cdd7e6d4 100644
--- a/gfx/layers/opengl/MacIOSurfaceTextureHostOGL.cpp
+++ b/gfx/layers/opengl/MacIOSurfaceTextureHostOGL.cpp
@@ -16,7 +16,7 @@ MacIOSurfaceTextureHostOGL::MacIOSurfaceTextureHostOGL(TextureFlags aFlags,
 {
   mSurface = MacIOSurface::LookupSurface(aDescriptor.surface(),
                                          aDescriptor.scaleFactor(),
-                                         aDescriptor.hasAlpha());
+                                         !aDescriptor.isOpaque());
 }
 
 bool