diff --git a/R/PipeOpMCBoost.R b/R/PipeOpMCBoost.R
index 9f98c9d..9b34f01 100644
--- a/R/PipeOpMCBoost.R
+++ b/R/PipeOpMCBoost.R
@@ -42,6 +42,7 @@
 #' library(mlr3)
 #' library(mlr3pipelines)
 #' # Attention: gunion inputs have to be in the correct order for now.
+#' \dontrun{
 #'  gr = gunion(list(
 #'    "data" = po("nop"),
 #'    "prediction" = po("learner_cv", lrn("classif.rpart"))
@@ -51,6 +52,7 @@
 #' tid = sample(1:208, 108)
 #' gr$train(tsk$clone()$filter(tid))
 #' gr$predict(tsk$clone()$filter(setdiff(1:208, tid)))
+#' }
 #' @family PipeOps
 #' @seealso https://mlr3book.mlr-org.com/list-pipeops.html
 #' @export
diff --git a/man/mlr_pipeops_mcboost.Rd b/man/mlr_pipeops_mcboost.Rd
index 372d06f..c0a48b3 100644
--- a/man/mlr_pipeops_mcboost.Rd
+++ b/man/mlr_pipeops_mcboost.Rd
@@ -59,6 +59,7 @@ Only methods inherited from \code{\link[mlr3pipelines:PipeOp]{mlr3pipelines::Pip
 library(mlr3)
 library(mlr3pipelines)
 # Attention: gunion inputs have to be in the correct order for now.
+\dontrun{
  gr = gunion(list(
    "data" = po("nop"),
    "prediction" = po("learner_cv", lrn("classif.rpart"))
@@ -69,6 +70,7 @@ tid = sample(1:208, 108)
 gr$train(tsk$clone()$filter(tid))
 gr$predict(tsk$clone()$filter(setdiff(1:208, tid)))
 }
+}
 \seealso{
 https://mlr3book.mlr-org.com/list-pipeops.html
 }