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diff --git a/python/google/protobuf/pyext/message.cc b/python/google/protobuf/pyext/message.cc
index 3ff31e2..31d4003 100644
--- a/python/google/protobuf/pyext/message.cc
+++ b/python/google/protobuf/pyext/message.cc
@@ -121,11 +121,7 @@ namespace message_meta {
namespace {
// Copied over from internal 'google/protobuf/stubs/strutil.h'.
inline void LowerString(std::string* s) {
- std::string::iterator end = s->end();
- for (std::string::iterator i = s->begin(); i != end; ++i) {
- // tolower() changes based on locale. We don't want this!
- if ('A' <= *i && *i <= 'Z') *i += 'a' - 'A';
- }
+ s->to_lower();
}
} // namespace
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