diff --git a/common-functions b/common-functions
index 3e36add..aa4f026 100755
--- a/common-functions
+++ b/common-functions
@@ -328,6 +328,7 @@ service_linked_apps() {
   local SERVICE_ROOT="$PLUGIN_DATA_ROOT/$SERVICE"
   local LINKS_FILE="$SERVICE_ROOT/LINKS"
 
+  touch "$LINKS_FILE"
   [[ -z $(< "$LINKS_FILE") ]] && echo '-' && return 0
 
   tr '\n' ' ' < "$LINKS_FILE"
diff --git a/config b/config
index bce024e..e2c05a2 100644
--- a/config
+++ b/config
@@ -2,10 +2,9 @@
 export MONGO_IMAGE=${MONGO_IMAGE:="mongo"}
 export MONGO_IMAGE_VERSION=${MONGO_IMAGE_VERSION:="3.2.9"}
 export MONGO_ROOT=${MONGO_ROOT:="/var/lib/dokku/services/mongo"}
-export MONGO_CONFIG_OPTIONS=${MONGO_CONFIG_OPTIONS:=" --storageEngine wiredTiger --auth "}
 
 export PLUGIN_COMMAND_PREFIX="mongo"
-export PLUGIN_CONFIG_ROOT="${DOKKU_LIB_ROOT}/config/${PLUGIN_COMMAND_PREFIX}"
+export PLUGIN_CONFIG_ROOT=${PLUGIN_CONFIG_ROOT:="$DOKKU_LIB_ROOT/config/$PLUGIN_COMMAND_PREFIX"}
 export PLUGIN_DATA_ROOT=$MONGO_ROOT
 export PLUGIN_DATASTORE_PORTS=(27017 27018 27019 28017)
 export PLUGIN_DATASTORE_WAIT_PORT=27017
@@ -24,3 +23,5 @@ fi
 if [[ -d "$PLUGIN_DATA_ROOT/*" ]]; then
   rm -rf "${PLUGIN_DATA_ROOT:?}/*"
 fi
+
+export MONGO_CONFIG_OPTIONS=${MONGO_CONFIG_OPTIONS:=" --storageEngine wiredTiger --auth "}
diff --git a/tests/test_helper.bash b/tests/test_helper.bash
index c8e3f0f..f2e0b2e 100644
--- a/tests/test_helper.bash
+++ b/tests/test_helper.bash
@@ -10,6 +10,7 @@ export PLUGIN_AVAILABLE_PATH="$PLUGIN_PATH"
 export PLUGIN_CORE_AVAILABLE_PATH="$PLUGIN_PATH"
 export MONGO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/fixtures"
 export PLUGIN_DATA_ROOT="$MONGO_ROOT"
+export PLUGIN_CONFIG_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
 if [[ "$(uname)" == "Darwin" ]]; then
   export PLUGN_URL="https://github.com/dokku/plugn/releases/download/v0.3.0/plugn_0.3.0_darwin_x86_64.tgz"
 else
@@ -19,6 +20,9 @@ fi
 mkdir -p "$PLUGIN_DATA_ROOT"
 rm -rf "${PLUGIN_DATA_ROOT:?}"/*
 
+mkdir -p "$PLUGIN_CONFIG_ROOT"
+rm -rf "${PLUGIN_CONFIG_ROOT:?}"/*
+
 flunk() {
   { if [ "$#" -eq 0 ]; then cat -
     else echo "$*"