diff --git a/interface/ri_tk_cmd.py b/interface/ri_tk_cmd.py
index bb9ff75..b4dff79 100644
--- a/interface/ri_tk_cmd.py
+++ b/interface/ri_tk_cmd.py
@@ -76,9 +76,9 @@ def mp_top_ok():
                 # if format, use the filesystem just set
                 idx2  = int(idxs2[0])
                 fs    = eval(display.var_dict['mp_top_fs'].get())[idx2]
-            elif dev in Partition.dict.keys():
+            elif dev in ri_data.Partition.dict.keys():
                 # else use the filesystem in Partition
-                fs = Partition.dict[dev].filesystem
+                fs = ri_data.Partition.dict[dev].filesystem
             else:
                 fs = ' '
             s2 = dev.ljust(10) + dr.ljust(10) + fs.ljust(10) + fm.ljust(4) + sz.ljust(6) + ri_data.Partition.unit