diff --git a/MLS.tex b/MLS.tex
index 2bcb681a2..606d9b4f2 100644
--- a/MLS.tex
+++ b/MLS.tex
@@ -2,7 +2,9 @@
 \NeedsTeXFormat{LaTeX2e}
 \usepackage[utf8]{inputenc}
 \input{preamble.tex}
+\ifpdf
 \addbibresource{mls.bib}
+\fi
 
 % Define title for use by LaTeXML.
 % An extended title is defined separately in the 'titlepage'.
@@ -168,5 +170,9 @@
 
 \clearpage\phantomsection
 \addcontentsline{toc}{chapter}{\bibname}
+\ifpdf
 \printbibliography
+\else
+\bibliography{mls}
+\fi
 \end{document}
diff --git a/preamble.tex b/preamble.tex
index ba28b7420..209b849f7 100644
--- a/preamble.tex
+++ b/preamble.tex
@@ -77,17 +77,30 @@
 \setcounter{totalnumber}{1000}
 \raggedbottom
 
+\ifpdf
 \usepackage{hyperref}
+\else
+\usepackage[backref=page]{hyperref} % Need backref, since we can't use biblatex.
+\fi
 % The bookmarks are used as table-of-contents in Acrobat
 % The default (magenta for urls and red for internal links) isn't nice
 \hypersetup{bookmarksnumbered=true, hidelinks, urlcolor=blue, linkcolor=blue}
 
+\ifpdf
 \usepackage[
   style=authoryear,
   backref=true,
-  maxnames=6,
+  maxnames=6
 ]{biblatex}
 \setlength\bibitemsep{0.5\baselineskip}
+\else
+% Use BibTeX due to LaTeXML problems with biblatex.
+\usepackage[round,authoryear]{natbib}
+\bibliographystyle{plainnat}
+% Define macro aliases with the names used by bibliatex:
+\let\textcite\citet
+\let\parencite\citep
+\fi
 
 \usepackage{multirow} % for multirow entries in tables