diff --git a/book.toml b/book.toml
index eb2f6806..b84b1e75 100644
--- a/book.toml
+++ b/book.toml
@@ -1,6 +1,6 @@
 [book]
 title = "Rust Compiler Development Guide"
-author = "The Rust Project Developers"
+authors = ["The Rust Project Developers"]
 description = "A guide to developing the Rust compiler (rustc)"
 
 [build]