diff --git a/src/calibre/gui2/actions/edit_metadata.py b/src/calibre/gui2/actions/edit_metadata.py
index 15e47b49ff..4e6a4723f7 100644
--- a/src/calibre/gui2/actions/edit_metadata.py
+++ b/src/calibre/gui2/actions/edit_metadata.py
@@ -158,7 +158,7 @@ class EditMetadataAction(InterfaceAction):
 
         id_map = {}
         for bid in good_ids:
-            opf = os.path.join(tdir, '%d.mi')
+            opf = os.path.join(tdir, '%d.mi'%bid)
             if not os.path.exists(opf):
                 opf = None
             cov = os.path.join(tdir, '%d.cover'%bid)