diff --git a/src/docs/asciidoc/index.adoc b/src/docs/asciidoc/index.adoc
index 9a722803..bb5fa2c2 100644
--- a/src/docs/asciidoc/index.adoc
+++ b/src/docs/asciidoc/index.adoc
@@ -2,7 +2,7 @@
 Robert Winkler
 :toc: left
 :toclevels: 3
-:source-highlighter: highlight.js
+:source-highlighter: coderay
 :numbered:
 :hardbreaks:
 :revnumber: {project-version}