Reflect new name of index style file.
diff --git a/Doc/tools/mkhowto.sh b/Doc/tools/mkhowto.sh
index 0fdf09d..8fadb03 100755
--- a/Doc/tools/mkhowto.sh
+++ b/Doc/tools/mkhowto.sh
@@ -119,7 +119,7 @@
     fi
     if [ -f $MYFILE.idx ] ; then
 	$MYDIR/fix_hack $MYFILE.idx || exit $?
-	makeindex -s $TOPDIR/texinputs/myindex.ist $MYFILE.idx || exit $?
+	makeindex -s $TOPDIR/texinputs/python.ist $MYFILE.idx || exit $?
     fi
     if [ -f $MYFILE.toc -a $MYLATEX = pdflatex ] ; then
 	$MYDIR/toc2bkm.py -c section $MYFILE