diff --git a/_headers b/_headers
index f930ffb5fb..a90a37aff1 100644
--- a/_headers
+++ b/_headers
@@ -1,2 +1,2 @@
 /*
-  Content-Security-Policy-Report-Only: default-src https: blob: http://www.google-analytics.com/* 'unsafe-eval' 'unsafe-inline';
+  Content-Security-Policy-Report-Only: default-src https: blob: data: http://www.google-analytics.com/* 'unsafe-eval' 'unsafe-inline';