diff --git a/roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-synapse.conf.j2 b/roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-synapse.conf.j2
index 8fd879586..8729bdc6b 100644
--- a/roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-synapse.conf.j2
+++ b/roles/matrix-nginx-proxy/templates/nginx/conf.d/matrix-synapse.conf.j2
@@ -64,6 +64,7 @@
 
 		proxy_set_header Host $host;
 		proxy_set_header X-Forwarded-For $remote_addr;
+		add_header Access-Control-Allow-Origin *;
 	}
 	{% endif %}