diff --git a/dcc/thumb.py b/dcc/thumb.py
index a1afa95..9240756 100644
--- a/dcc/thumb.py
+++ b/dcc/thumb.py
@@ -28,7 +28,7 @@ class Thumb(dcc.doom_base.WadMap):
 
             if parsed_args.index:
                 with wand.image.Image(
-                    filename=self.output.joinpath("doomed_index.png")
+                    filename=self.fabricate.joinpath("doomed_index.png")
                 ) as di:
                     di.border(tc, 1, 1)
                     bi.composite(di, gravity="north_east")