diff --git a/mirror_bot.py b/mirror_bot.py
index bfd030e..52bb671 100755
--- a/mirror_bot.py
+++ b/mirror_bot.py
@@ -109,7 +109,7 @@ class PostMirror:
 		assert None not in attachments
 
 		await self._fedi.post(
-			post['source'].replace('@', '@\u200b'),
+			post['source']['content'].replace('@', '@\u200b'),
 			cw=post['summary'],
 			visibility='unlisted',
 			media_ids=attachments,