diff --git a/include/llvm/MC/MCAssembler.h b/include/llvm/MC/MCAssembler.h
index 6965e34998a..d2b5c80a1a5 100644
--- a/include/llvm/MC/MCAssembler.h
+++ b/include/llvm/MC/MCAssembler.h
@@ -191,7 +191,7 @@ public:
   MCInst &getInst() { return Inst; }
   const MCInst &getInst() const { return Inst; }
 
-  void setInst(MCInst Value) { Inst = Value; }
+  void setInst(const MCInst& Value) { Inst = Value; }
 
   /// @}
   /// @name Fixup Access