diff --git a/lib/middleware/helmet.js b/lib/middleware/helmet.js
index e47f5ece66..b847d83aa8 100644
--- a/lib/middleware/helmet.js
+++ b/lib/middleware/helmet.js
@@ -12,6 +12,13 @@ module.exports = function(config) {
                         'data:',
                         'gravatar.com',
                     ],
+                    styleSrc: [
+                        "'self'",
+                        'fonts.googleapis.com',
+                        'fonts.gstatic.com',
+                        'data:',
+                        'unsafe-inline',
+                    ],
                 },
             },
         });