diff --git a/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp b/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
index 5ce3c7b35493b..1d79c3018439e 100644
--- a/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
+++ b/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
@@ -1974,7 +1974,7 @@ void DXILBitcodeWriter::writeConstants(unsigned FirstVal, unsigned LastVal,
                        unsigned(IA->getDialect() & 1) << 2);
 
       // Add the asm string.
-      const std::string &AsmStr = IA->getAsmString();
+      StringRef AsmStr = IA->getAsmString();
       Record.push_back(AsmStr.size());
       Record.append(AsmStr.begin(), AsmStr.end());