diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 16e0bd7..0e9f1a0 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -529,6 +529,7 @@
   KEYWORD(module);
   KEYWORD(asm);
   KEYWORD(sideeffect);
+  KEYWORD(msasm);
   KEYWORD(gc);
 
   KEYWORD(ccc);