\let\ltj@@al@getanddefine@fonts=\getanddefine@fonts
\def\ltj@@ja@getanddefine@fonts#1#2{%
+ \let\if@ltj@tempif\ifltjselectfont@force@define
+ \ltjselectfont@force@definetrue
\xdef\font@name{\csname \string#2/\tf@size\endcsname}%
\pickup@jfont\let\textfont@name\font@name
\xdef\font@name{\csname \string#2/\sf@size\endcsname}%
\pickup@jfont\let\scriptfont@name\font@name
\xdef\font@name{\csname \string#2/\ssf@size\endcsname}%
\pickup@jfont
+ \let\ifltjselectfont@force@define\if@ltj@tempif
\edef\math@fonts{\math@fonts\ltj@setpar@global%
\ltj@@set@stackfont#1,\textfont@name:{MJT}%
\ltj@@set@stackfont#1,\scriptfont@name:{MJS}%