diff --git a/spec/doc.tex b/spec/doc.tex
index 2ce54c6d3005efcca90755c57c20ae17dca8b2cb..afd6b2f89842f69dc5b8ae4cde945f89e5cab18a 100644
--- a/spec/doc.tex
+++ b/spec/doc.tex
@@ -5,9 +5,10 @@
 \documentclass{scrartcl}
 
 \usepackage{scrlayer-scrpage}
-\usepackage{unicode-math}
 \usepackage{fontsetup}
+\setmainfont{CMU Serif}
 
+\usepackage{unicode-math}
 \usepackage{minted}
 \usemintedstyle{trac}
 \renewcommand{\MintedPygmentize}{./highlight.py}