diff --git a/docs/network-spec/network-spec.tex b/docs/network-spec/network-spec.tex
index ec5fd278f0..53b87a0295 100644
--- a/docs/network-spec/network-spec.tex
+++ b/docs/network-spec/network-spec.tex
@@ -1,4 +1,4 @@
-\documentclass{report}
+\xdocumentclass{report}
 
 \usepackage[dvipsnames,x11names]{xcolor}
 \usepackage[utf8]{inputenc}