diff --git a/spec/conf.py b/spec/conf.py
index 48fe552db..da30e54b0 100644
--- a/spec/conf.py
+++ b/spec/conf.py
@@ -114,7 +114,7 @@
     #'repo_name': 'Project',
 
     "html_minify": False,
-    "html_prettify": True,
+    "html_prettify": False,
     "css_minify": True,
     "logo_icon": "&#xe869",
     "repo_type": "github",