diff --git a/vignettes/sf-operations.Rmd b/vignettes/sf-operations.Rmd
index 422ef71..0fd6ed0 100644
--- a/vignettes/sf-operations.Rmd
+++ b/vignettes/sf-operations.Rmd
@@ -274,7 +274,7 @@ s01_sf |>
   covered_by_iy
 ```
 
-```{r eval=ggplot2_inst, fig.width=5, fig.height=5, out.width="80%", fig.align='center'}
+```{r eval=ggplot2_inst & forcats_inst, fig.width=5, fig.height=5, out.width="80%", fig.align='center'}
 covered_by_iy |> 
   mutate(plt_vclass = plt_vclass |> 
            fct_infreq() |>