diff --git a/llvm/include/llvm/MC/MCMachObjectWriter.h b/llvm/include/llvm/MC/MCMachObjectWriter.h
--- a/llvm/include/llvm/MC/MCMachObjectWriter.h
+++ b/llvm/include/llvm/MC/MCMachObjectWriter.h
@@ -28,7 +28,9 @@
 class MCMachObjectTargetWriter : public MCObjectTargetWriter {
   const unsigned Is64Bit : 1;
   const uint32_t CPUType;
-  const uint32_t CPUSubtype;
+protected:
+  uint32_t CPUSubtype;
+public:
   unsigned LocalDifference_RIT;
 
 protected: