diff --git a/fw/fw.py b/fw/fw.py
index d2ed62a..4fb4916 100644
--- a/fw/fw.py
+++ b/fw/fw.py
@@ -46,7 +46,7 @@ class MyLongTask(LongTasks):
 		words = []
 		for s in segments:
 			if s.words:
-				words.append([word.start, word.end, word.word] for word in s.words])
+				words.append([[word.start, word.end, word.word] for word in s.words])
 
 		return {
 			'language': info.language,