diff --git a/base/string_utils.hpp b/base/string_utils.hpp
index 8cf4e5957c..f24fddf17c 100644
--- a/base/string_utils.hpp
+++ b/base/string_utils.hpp
@@ -37,7 +37,7 @@ void Normalize(UniString & s);
 void AsciiToLower(string & s);
 void Trim(string & s);
 
-//void MakeLowerCase(string & s);
+void MakeLowerCase(string & s);
 string MakeLowerCase(string const & s);
 bool EqualNoCase(string const & s1, string const & s2);