diff --git a/texinfo.tex b/texinfo.tex
index 284d6993..84d6683e 100644
--- a/texinfo.tex
+++ b/texinfo.tex
@@ -1190,7 +1190,7 @@ where each line of input produces a line of output.}
 % Do not make many font distinctions in general in the index, since they
 % aren't very useful.
 \setfont\ninett\ttshape{9}{1000}
-\setfont\ninettsl\ttslshape{9}{1000}
+\setfont\ninettsl\ttslshape{10}{900}
 \setfont\indrm\rmshape{9}{1000}
 \setfont\indit\slshape{9}{1000}
 \let\indsl=\indit