diff --git a/config b/config
index 4bcf422..374c97e 100644
--- a/config
+++ b/config
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
-export MONGO_IMAGE=${MONGO_IMAGE:="$(awk -F '[ :]' '{print $2}' Dockerfile)"}
-export MONGO_IMAGE_VERSION=${MONGO_IMAGE_VERSION:="$(awk -F '[ :]' '{print $3}' Dockerfile)"}
+_DIR="$(dirname $0)"
+export MONGO_IMAGE=${MONGO_IMAGE:="$(awk -F '[ :]' '{print $2}' $_DIR/Dockerfile)"}
+export MONGO_IMAGE_VERSION=${MONGO_IMAGE_VERSION:="$(awk -F '[ :]' '{print $3}' $_DIR/Dockerfile)"}
 export MONGO_ROOT=${MONGO_ROOT:="$DOKKU_LIB_ROOT/services/mongo"}
 export MONGO_HOST_ROOT=${MONGO_HOST_ROOT:=$MONGO_ROOT}