diff --git a/mlir/lib/Tools/lsp-server-support/Transport.cpp b/mlir/lib/Tools/lsp-server-support/Transport.cpp
index 1e90ab32281f5..ca7ffdf78d3a1 100644
--- a/mlir/lib/Tools/lsp-server-support/Transport.cpp
+++ b/mlir/lib/Tools/lsp-server-support/Transport.cpp
@@ -41,7 +41,7 @@ class Reply {
   void operator()(llvm::Expected<llvm::json::Value> reply);
 
 private:
-  StringRef method;
+  std::string method;
   std::atomic<bool> replied = {false};
   llvm::json::Value id;
   JSONTransport *transport;