diff --git a/docs/public/_headers b/docs/public/_headers
index 48d0cdc..b987a06 100644
--- a/docs/public/_headers
+++ b/docs/public/_headers
@@ -1,5 +1,5 @@
 /images/*
-  Access-Control-Allow-Origin: *
+  Access-Control-Allow-Origin: "*"
 
 *.png
-  Access-Control-Allow-Origin: *
+  Access-Control-Allow-Origin: "*"