diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index 856a602..944fc40 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/lib/Sema/SemaStmt.cpp
@@ -2890,7 +2890,7 @@
 
   // Empty asm statements don't need to instantiate the AsmParser, etc.
   if (AsmToks.empty()) {
-    std::string AsmString;
+    StringRef AsmString;
     MSAsmStmt *NS =
       new (Context) MSAsmStmt(Context, AsmLoc, /* IsSimple */ true,
                               /* IsVolatile */ true, AsmToks, LineEnds,