diff --git a/prism/etc/prism.css b/prism/etc/prism.css
index 1bab4b20..a24d6bc8 100644
--- a/prism/etc/prism.css
+++ b/prism/etc/prism.css
@@ -2,3 +2,5 @@
 .prismident { color:#cc0000 }
 .prismnum { color:#0000cc }
 .prismcomment { font-style:italic; color:#009900 }
+.prismpreproc { color:#a020f0; }
+