diff --git a/kallithea/public/less/style.less b/kallithea/public/less/style.less
--- a/kallithea/public/less/style.less
+++ b/kallithea/public/less/style.less
@@ -9,6 +9,7 @@ body {
 
 /* class for texts where newlines should be preserved, for very light-weight ascii art markup (like pull request descriptions) */
 .formatted-fixed {
+  font-family: @font-family-monospace;
   white-space: pre-wrap;
 }