diff --git a/default.beamer b/default.beamer
index b8d1b8fe0..fffd02d39 100644
--- a/default.beamer
+++ b/default.beamer
@@ -7,6 +7,7 @@ $if(colortheme)$
 $endif$
 \usepackage{amssymb,amsmath}
 \usepackage{ifxetex,ifluatex}
+\usepackage{fixltx2e} % provides \textsubscript
 \ifxetex
   \usepackage{fontspec,xltxtra,xunicode}
   \defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
@@ -64,9 +65,6 @@ $if(strikeout)$
 % avoid problems with \sout in headers with hyperref:
 \pdfstringdefDisableCommands{\renewcommand{\sout}{}}
 $endif$
-$if(subscript)$
-\newcommand{\textsubscr}[1]{\ensuremath{_{\scriptsize\textrm{#1}}}}
-$endif$
 \setlength{\parindent}{0pt}
 \setlength{\parskip}{6pt plus 2pt minus 1pt}
 \setlength{\emergencystretch}{3em}  % prevent overfull lines
diff --git a/default.latex b/default.latex
index f181ee24a..23fb95026 100644
--- a/default.latex
+++ b/default.latex
@@ -1,6 +1,7 @@
 \documentclass[$if(fontsize)$$fontsize$,$endif$$if(lang)$$lang$,$endif$]{$documentclass$}
 \usepackage{amssymb,amsmath}
 \usepackage{ifxetex,ifluatex}
+\usepackage{fixltx2e} % provides \textsubscript
 \ifxetex
   \usepackage{fontspec,xltxtra,xunicode}
   \defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
@@ -117,9 +118,6 @@ $if(strikeout)$
 % avoid problems with \sout in headers with hyperref:
 \pdfstringdefDisableCommands{\renewcommand{\sout}{}}
 $endif$
-$if(subscript)$
-\newcommand{\textsubscr}[1]{\ensuremath{_{\scriptsize\textrm{#1}}}}
-$endif$
 \setlength{\parindent}{0pt}
 \setlength{\parskip}{6pt plus 2pt minus 1pt}
 \setlength{\emergencystretch}{3em}  % prevent overfull lines