diff --git a/book/tables/lab-results/lbt02.qmd b/book/tables/lab-results/lbt02.qmd
index 57f5b48632..d5fe1c941d 100644
--- a/book/tables/lab-results/lbt02.qmd
+++ b/book/tables/lab-results/lbt02.qmd
@@ -10,6 +10,7 @@ subtitle: Laboratory Test Results by Visit
 ```{r setup, echo = FALSE, warning = FALSE, message = FALSE}
 # Preparation of an illustrative dataset
 library(tern)
+library(magrittr)
 
 adsl <- random.cdisc.data::cadsl
 adlb <- random.cdisc.data::cadlb