diff --git a/src/gui/render/renderMetal.mm b/src/gui/render/renderMetal.mm
index fbd7f16d7..3261d403a 100644
--- a/src/gui/render/renderMetal.mm
+++ b/src/gui/render/renderMetal.mm
@@ -33,7 +33,7 @@ struct FurnaceGUIRenderMetalPrivate {
 
 class FurnaceMetalTexture: public FurnaceGUITexture {
   public:
-  MTLTexture* tex;
+  id<MTLTexture> tex;
   FurnaceMetalTexture():
     tex(NULL) {}
 };