diff --git a/h5bp/web_performance/compression.conf b/h5bp/web_performance/compression.conf
index 31f7a14..1f9dc3c 100644
--- a/h5bp/web_performance/compression.conf
+++ b/h5bp/web_performance/compression.conf
@@ -55,6 +55,8 @@ gzip_types
   font/ttf
   image/bmp
   image/svg+xml
+  image/vnd.microsoft.icon
+  image/x-icon
   text/cache-manifest
   text/calendar
   text/css