diff --git a/source/iostreams.tex b/source/iostreams.tex
index c983e9b1ab..cd296dd4b1 100644
--- a/source/iostreams.tex
+++ b/source/iostreams.tex
@@ -2747,7 +2747,7 @@
 \returns \tcode{str}.
 \end{itemdescr}
 
-\rSec3[error.reporting]{Error reporting}
+\rSec2[error.reporting]{Error reporting}
 
 \indexlibrarymember{make_error_code}{io_errc}%
 \begin{itemdecl}