diff --git a/xml2xslt.xsl b/xml2xslt.xsl
index b90e463..95c2339 100644
--- a/xml2xslt.xsl
+++ b/xml2xslt.xsl
@@ -403,15 +403,17 @@
 
 \usepackage{multirow}
 \usepackage{graphicx}
-\usepackage{verbatim}       % needed for \verbatiminput
-\usepackage{relalg}         % needed for join operators
+\usepackage{verbatim}           % needed for \verbatiminput
+\usepackage{relalg}             % needed for join operators
 \usepackage{pifont}
-\usepackage{siunitx}        % number and SI unit formatting
-\usepackage{listings}       % nicely formatted code listings
-\usepackage[normalem]{ulem} % fancy underlining, strikeout, etc.
+\usepackage[mode=text]{siunitx} % number and SI unit formatting ([mode=text] needed to make it use the correct
+                                % maths typeface under Unicode/fontspec, otherwise it uses Computer Modern. Works
+                                % fine in non-Unicode regardless.)
+\usepackage{listings}           % nicely formatted code listings
+\usepackage[normalem]{ulem}     % fancy underlining, strikeout, etc.
 \usepackage{boxedminipage}
-\usepackage{parskip}        % Space-separated rather than indented paragraphs.
-\usepackage{rotating}		% Rotate stuff.
+\usepackage{parskip}            % Space-separated rather than indented paragraphs.
+\usepackage{rotating}		    % Rotate stuff.
 
 </xsl-out:text>