diff --git a/include/llvm/MC/MCInstPrinter.h b/include/llvm/MC/MCInstPrinter.h
index cb7225f81a8..b4258bef04c 100644
--- a/include/llvm/MC/MCInstPrinter.h
+++ b/include/llvm/MC/MCInstPrinter.h
@@ -41,7 +41,7 @@ protected:
   const MCRegisterInfo &MRI;
 
   /// The current set of available features.
-  unsigned AvailableFeatures;
+  uint64_t AvailableFeatures;
 
   /// True if we are printing marked up assembly.
   bool UseMarkup;
@@ -77,8 +77,8 @@ public:
   /// printRegName - Print the assembler register name.
   virtual void printRegName(raw_ostream &OS, unsigned RegNo) const;
 
-  unsigned getAvailableFeatures() const { return AvailableFeatures; }
-  void setAvailableFeatures(unsigned Value) { AvailableFeatures = Value; }
+  uint64_t getAvailableFeatures() const { return AvailableFeatures; }
+  void setAvailableFeatures(uint64_t Value) { AvailableFeatures = Value; }
 
   bool getUseMarkup() const { return UseMarkup; }
   void setUseMarkup(bool Value) { UseMarkup = Value; }
diff --git a/include/llvm/MC/MCTargetAsmParser.h b/include/llvm/MC/MCTargetAsmParser.h
index 6e96e8becda..a48c5d15f55 100644
--- a/include/llvm/MC/MCTargetAsmParser.h
+++ b/include/llvm/MC/MCTargetAsmParser.h
@@ -88,7 +88,7 @@ protected: // Can only create subclasses.
   MCTargetAsmParser();
 
   /// AvailableFeatures - The current set of available features.
-  unsigned AvailableFeatures;
+  uint64_t AvailableFeatures;
 
   /// ParsingInlineAsm - Are we parsing ms-style inline assembly?
   bool ParsingInlineAsm;
@@ -100,8 +100,8 @@ protected: // Can only create subclasses.
 public:
   virtual ~MCTargetAsmParser();
 
-  unsigned getAvailableFeatures() const { return AvailableFeatures; }
-  void setAvailableFeatures(unsigned Value) { AvailableFeatures = Value; }
+  uint64_t getAvailableFeatures() const { return AvailableFeatures; }
+  void setAvailableFeatures(uint64_t Value) { AvailableFeatures = Value; }
 
   bool isParsingInlineAsm () { return ParsingInlineAsm; }
   void setParsingInlineAsm (bool Value) { ParsingInlineAsm = Value; }