-\def\js@setfontsize#1#2#3{%
- \edef\Fsize{\the\dimexpr\directlua{tex.sprint(#2*\js@magscale)}pt}%
- \@setfontsize#1{#2\js@mpt}{#3\js@mpt}}
+\def\ltjs@setfontsize#1#2#3{%
+ \edef\Fsize{\the\dimexpr\directlua{tex.sprint(#2*\jsc@magscale)}pt}%
+ \@setfontsize#1{#2\jsc@mpt}{#3\jsc@mpt}}