diff --git a/book.toml b/book.toml
index cc8720f7..e19b9ff9 100644
--- a/book.toml
+++ b/book.toml
@@ -28,6 +28,7 @@ disabled = false
 [output.pandoc.profile.pdf]
 output-file = "rust-course.pdf"
 pdf-engine = "tectonic"
+pdf-engine-opt = ["-k"]
 to = "pdf"
 variables = { mainfont = "Noto Sans CJK SC", sansfont = "Noto Sans CJK SC", CJKmainfont = "Noto Sans CJK SC" }