diff --git a/include/boost/regex/v4/cpp_regex_traits.hpp b/include/boost/regex/v4/cpp_regex_traits.hpp
index 593271f4..98af56cf 100644
--- a/include/boost/regex/v4/cpp_regex_traits.hpp
+++ b/include/boost/regex/v4/cpp_regex_traits.hpp
@@ -961,6 +961,8 @@ private:
 template <class charT>
 int cpp_regex_traits<charT>::toi(const charT*& first, const charT* last, int radix)const
 {
+   // we do NOT want to parse any thousands separators inside the stream:
+   last = std::find(first, last, BOOST_USE_FACET(std::numpunct<char>, m_pimpl->m_is.getloc()).thousands_sep());
    m_pimpl->m_sbuf.pubsetbuf(const_cast<charT*>(static_cast<const charT*>(first)), static_cast<std::streamsize>(last-first));
    m_pimpl->m_is.clear();
    if(std::abs(radix) == 16) m_pimpl->m_is >> std::hex;