diff --git a/doc/interprocess.qbk b/doc/interprocess.qbk
index fee02ac..27124a2 100644
--- a/doc/interprocess.qbk
+++ b/doc/interprocess.qbk
@@ -6771,6 +6771,7 @@ thank them:
    * [@https://github.com/boostorg/interprocess/issues/59 GitHub Issue #59 (['"warning: ISO C++ prohibits anonymous structs [-Wpedantic]"])].
    * [@https://github.com/boostorg/interprocess/issues/60 GitHub Issue #60 (['"warning: cast between incompatible function types from boost::interprocess::winapi::farproc_t..."])].
    * [@https://github.com/boostorg/interprocess/issues/61 GitHub Issue #61 (['"warning: struct winapi::*_BIPC has virtual functions and accessible non-virtual destructor"])].
+   * [@https://github.com/boostorg/interprocess/issues/64 GitHub Issue #64 (['"UBSan: runtime error: load of value 4294967295, (...) for type 'boost::interprocess::mode_t'"])].
    * [@https://github.com/boostorg/interprocess/pull/68   GitHub Pull #68 (['"Prepare for C++20 and remove "throw()" usage"])].
 
 [endsect]
diff --git a/include/boost/interprocess/detail/file_wrapper.hpp b/include/boost/interprocess/detail/file_wrapper.hpp
index 58f28e9..99e0fea 100644
--- a/include/boost/interprocess/detail/file_wrapper.hpp
+++ b/include/boost/interprocess/detail/file_wrapper.hpp
@@ -113,12 +113,13 @@ class file_wrapper
    bool priv_open_or_create(ipcdetail::create_enum_t type, const char *filename, mode_t mode, const permissions &perm);
 
    file_handle_t  m_handle;
-   mode_t      m_mode;
-   std::string       m_filename;
+   mode_t         m_mode;
+   std::string    m_filename;
 };
 
 inline file_wrapper::file_wrapper()
-   :  m_handle(file_handle_t(ipcdetail::invalid_file()))
+   : m_handle(file_handle_t(ipcdetail::invalid_file()))
+   , m_mode(read_only), m_filename()
 {}
 
 inline file_wrapper::~file_wrapper()