diff --git a/mongo/lib/common b/mongo/lib/common
index cf3bf7e..c1fd9aa 100644
--- a/mongo/lib/common
+++ b/mongo/lib/common
@@ -9,7 +9,7 @@ export DATA_DIR=$SERVICE_DATASTORE$DB_DATADIR
 
 
 is_db_locked() {
-    is_volume_used "$DATASTORE/${SERVICE_NAME}"
+    is_volume_used "${DATA_DIR}"
 }