diff --git a/include/llvm/MC/MCObjectWriter.h b/include/llvm/MC/MCObjectWriter.h
index f70a3d1851e..522ee77826f 100644
--- a/include/llvm/MC/MCObjectWriter.h
+++ b/include/llvm/MC/MCObjectWriter.h
@@ -49,7 +49,7 @@ protected: // Can only create subclasses.
 public:
   virtual ~MCObjectWriter();
 
-  bool isLittleEndian() { return IsLittleEndian; }
+  bool isLittleEndian() const { return IsLittleEndian; }
 
   raw_ostream &getStream() { return OS; }