diff --git a/botcmd.py b/botcmd.py
index 5471582..5eae4f9 100644
--- a/botcmd.py
+++ b/botcmd.py
@@ -149,7 +149,9 @@ def handle_message(*, prefix, message, nick, channel, irc):
 					if response.info().get_content_type() == 'text/html':
 						# First 4KiB of a page should be enough for any <title>
 						# Turns out it's not, so download 64KiB
-						page_source_fragment = response.read(64 * 1024)
+						# As of 2023-09-10, youtube requires up to 320KiB (!),
+						# so download first 512KiB
+						page_source_fragment = response.read(512 * 1024)
 						title = sanitize(extract_title(page_source_fragment))
 
 						if title is not None: