diff --git a/include/llvm/MC/MCParser/AsmLexer.h b/include/llvm/MC/MCParser/AsmLexer.h
index 94e24acce09..21878899cac 100644
--- a/include/llvm/MC/MCParser/AsmLexer.h
+++ b/include/llvm/MC/MCParser/AsmLexer.h
@@ -46,7 +46,7 @@ public:
   
   void setBuffer(const MemoryBuffer *buf, const char *ptr = NULL);
   
-  StringRef LexUntilEndOfStatement();
+  virtual StringRef LexUntilEndOfStatement();
 
   bool isAtStartOfComment(char Char);
   
diff --git a/include/llvm/MC/MCParser/MCAsmLexer.h b/include/llvm/MC/MCParser/MCAsmLexer.h
index 9ae9c420ebe..d690e810bd3 100644
--- a/include/llvm/MC/MCParser/MCAsmLexer.h
+++ b/include/llvm/MC/MCParser/MCAsmLexer.h
@@ -143,6 +143,8 @@ public:
     return CurTok = LexToken();
   }
 
+  virtual StringRef LexUntilEndOfStatement() = 0;
+
   /// getLoc - Get the current source location.
   SMLoc getLoc() const;