diff --git a/src/invidious/videos/description.cr b/src/invidious/videos/description.cr
index 9f36477c..d448ba80 100644
--- a/src/invidious/videos/description.cr
+++ b/src/invidious/videos/description.cr
@@ -86,7 +86,8 @@ def parse_description(desc, video_id : String) : String?
     end
 
     # Copy the end of the string (past the last command).
-    remaining_length = utf16_length(content) - index
+    content_size = content.ascii_only? ? content.size : utf16_length(content)
+    remaining_length = content_size - index
     copy_string(str, iter, remaining_length) if remaining_length > 0
   end
 end