diff --git a/src/renderer/html_handlebars/hbs_renderer.rs b/src/renderer/html_handlebars/hbs_renderer.rs
index 0374fc07..946ce482 100644
--- a/src/renderer/html_handlebars/hbs_renderer.rs
+++ b/src/renderer/html_handlebars/hbs_renderer.rs
@@ -170,7 +170,13 @@ impl HtmlHandlebars {
// Set a dummy path to ensure other paths (e.g. in the TOC) are generated correctly
data_404.insert("path".to_owned(), json!("404.md"));
data_404.insert("content".to_owned(), json!(html_content_404));
- data_404.insert("title".to_owned(), json!("Page not found"));
+
+ let mut title = String::from("Page not found");
+ if let Some(book_title) = &ctx.config.book.title {
+ title.push_str(" - ");
+ title.push_str(book_title);
+ }
+ data_404.insert("title".to_owned(), json!(title));
let rendered = handlebars.render("index", &data_404)?;
let rendered =