diff --git a/app/modules/misskey_preview.py b/app/modules/misskey_preview.py
index ea4b09a..c30a243 100644
--- a/app/modules/misskey_preview.py
+++ b/app/modules/misskey_preview.py
@@ -40,7 +40,7 @@ class MisskeyPreviewModule(niobot.Module):
                     continue
 
                 text = textwrap.shorten(data["text"], width=1000)
-                rendered = self.bot._markdown_to_html(text)
+                rendered = await self.bot._markdown_to_html(text)
                 text_body = "<blockquote>%s</blockquote>" % rendered
                 body = "<a href=\"%s\">@%s:</a><br>%s" % (
                     "https://%s/@%s" % (parsed.netloc, username),