Apply patch from 2.5 branch related to #CORE-3400  http://sourceforge.net/p/firebird/mailman/message/27734396/ 



git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60041 65644016-39b1-43b1-bf79-96bc8fe82c15