diff --git a/lib/pleroma/plugs/http_security_plug.ex b/lib/pleroma/plugs/http_security_plug.ex
index 41e3a31f4..6a339b32c 100644
--- a/lib/pleroma/plugs/http_security_plug.ex
+++ b/lib/pleroma/plugs/http_security_plug.ex
@@ -75,7 +75,7 @@ defp csp_string do
         sources = get_proxy_and_attachment_sources()
         {[img_src, sources], [media_src, sources]}
       else
-        {img_src, media_src}
+        {[img_src, " https:"], [media_src, " https:"]}
       end
 
     connect_src = ["connect-src 'self' blob: ", static_url, ?\s, websocket_url]