diff --git a/enzyme/Enzyme/EnzymeLogic.cpp b/enzyme/Enzyme/EnzymeLogic.cpp
index b579fe027af..4fc218b49a3 100644
--- a/enzyme/Enzyme/EnzymeLogic.cpp
+++ b/enzyme/Enzyme/EnzymeLogic.cpp
@@ -6239,6 +6239,9 @@ llvm::Function *EnzymeLogic::CreateNoFree(RequestContext context, Function *F) {
 
   // clang-format off
   StringSet<> NoFreeDemangles = {
+      "std::__u::basic_streambuf<char, std::__u::char_traits<char>>::pubsync()",
+      "std::__u::basic_ostream<char, std::__u::char_traits<char>>::write(char const*, long)",
+      "std::__u::basic_filebuf<char, std::__u::char_traits<char>>::close()",
       "std::__u::basic_ios<wchar_t, std::__u::char_traits<wchar_t>>::imbue(std::__u::locale const&)",
       "std::__u::basic_filebuf<char, std::__u::char_traits<char>>::basic_filebuf()",
       "std::__u::basic_filebuf<char, std::__u::char_traits<char>>::open(char const*, unsigned int)",