diff --git a/grid.py b/grid.py
index ecdbb19..a0562f3 100644
--- a/grid.py
+++ b/grid.py
@@ -28,7 +28,7 @@ def query_vm(req_cube_id):
 def querydb(cubeid):
     """ open a metadata file """
     try:
-        dbfile = 'db/vm.{}.json'.format(cube)
+        dbfile = 'db/vm.{}.json'.format(cubeid)
         dbf = open(dbfile, 'r')
         data = json.load(dbf)
         dbf.close()