1 files changed, 1 insertions, 3 deletions
diff --git a/libcxx/test/support/demangle.h b/libcxx/test/support/demangle.h
index 41761fd420e..98d93c85ad7 100644
--- a/libcxx/test/support/demangle.h
+++ b/libcxx/test/support/demangle.h
@@ -34,9 +34,7 @@ inline std::string demangle(const char* mangled_name) {
 template <size_t N> struct Printer;
 inline std::string demangle(const char* mangled_name) {
   int status = 0;
-  std::string input(mangled_name);
-  input.insert(0, "_Z");
-  char* out = __cxxabiv1::__cxa_demangle(input.c_str(), nullptr, nullptr, &status);
+  char* out = __cxxabiv1::__cxa_demangle(mangled_name, nullptr, nullptr, &status);
   if (out != nullptr) {
     std::string res(out);
     std::free(out);