diff --git a/render.py b/render.py
index 6497e0d..d2c1d20 100644
--- a/render.py
+++ b/render.py
@@ -489,7 +489,7 @@ def render_all(options):
         os.makedirs(fragment_prefix, exist_ok=True)
         fragment_clips = fragment['clips']
         used_ids = {c['id'] for c in clips_used}
-        unused_fragment_clips = [c for c in fragment_clips if c['id'] not in clips_used]
+        unused_fragment_clips = [c for c in fragment_clips if c['id'] not in used_ids]
         print('fragment clips', len(fragment_clips), 'unused', len(unused_fragment_clips))
         print('--')
         print('Video:')