diff --git a/pandora/item/timelines.py b/pandora/item/timelines.py
index a39ceee6..68b660ac 100644
--- a/pandora/item/timelines.py
+++ b/pandora/item/timelines.py
@@ -217,7 +217,7 @@ def join_tiles(source_paths, durations, target_path):
         offset += durations[i]
     with open(os.path.join(target_path, 'cuts.json'), 'w') as f:
         # avoid float rounding artefacts
-        f.write('[' + ', '.join(map(lambda x: '%.2f' % x, cuts)) + ']')
+        f.write('[' + ', '.join(map(lambda x: '%.3f' % x, cuts)) + ']')
 
 def split_tiles(path, paths, durations):