diff --git a/config b/config
index ff57ac0..6624a3a 100644
--- a/config
+++ b/config
@@ -2,6 +2,7 @@
 export MONGO_IMAGE=${MONGO_IMAGE:="mongo"}
 export MONGO_IMAGE_VERSION=${MONGO_IMAGE_VERSION:="3.0.6"}
 export MONGO_ROOT=${MONGO_ROOT:="/var/lib/dokku/services/mongo"}
+export MONGO_CONFIG_OPTIONS=${MONGO_CONFIG_OPTIONS:=" --auth "}
 
 export PLUGIN_COMMAND_PREFIX="mongo"
 export PLUGIN_DATA_ROOT=$MONGO_ROOT