diff --git a/lld/wasm/Symbols.cpp b/lld/wasm/Symbols.cpp
--- a/lld/wasm/Symbols.cpp
+++ b/lld/wasm/Symbols.cpp
@@ -35,7 +35,7 @@
   if (name == "__main_argc_argv")
     return "main";
   if (wasm::config->demangle)
-    return demangle(name);
+    return demangle(std::string(name));
   return name.str();
 }