diff --git a/vignettes/parameters.Rmd b/vignettes/parameters.Rmd
index a65a39e38..f92b1bf14 100644
--- a/vignettes/parameters.Rmd
+++ b/vignettes/parameters.Rmd
@@ -281,7 +281,7 @@ plot(result, show_intercept = TRUE)
 ## Model Parameters of Meta-Analysis models
 
 ```{r}
-mydat <- data.frame(
+mydat <<- data.frame(
   effectsize = c(-0.393, 0.675, 0.282, -1.398),
   standarderror = c(0.317, 0.317, 0.13, 0.36)
 )