diff --git a/Procfile b/Procfile
index aef0e3b..7cb9958 100644
--- a/Procfile
+++ b/Procfile
@@ -1 +1 @@
-web: ./dandidav --ip-addr 0.0.0.0 --port $PORT
+web: ./dandidav --ip-addr 0.0.0.0 --port $PORT --prefer-s3-redirects