diff --git a/R/Renderer.R b/R/Renderer.R
index 8fc858ee..3340a75a 100644
--- a/R/Renderer.R
+++ b/R/Renderer.R
@@ -39,7 +39,7 @@ Renderer <- R6::R6Class( # nolint: object_name_linter.
         "\n```{r setup, include=FALSE}\nknitr::opts_chunk$set(%s)\n%s\n```\n",
         capture.output(dput(global_knitr)),
         if (identical(private$report_type, "powerpoint_presentation")) {
-          paste(capture.output(code_block_function), collapse = "\n")
+          paste0("code_block <- ", paste(deparse(format_code_block_for_slide), collapse = "\n"))
         } else {
           character(0)
         }
@@ -132,7 +132,7 @@ Renderer <- R6::R6Class( # nolint: object_name_linter.
         paste(
           sprintf(
             "---\n\n```{r, echo=FALSE}\ncode_block(\n%s)\n```\n",
-            shQuote(block_content_lst)
+            sQuote(block_content_lst, q = FALSE)
           ),
           collapse = "\n\n"
         )
diff --git a/R/utils.R b/R/utils.R
index 88533e78..1b0e7abc 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -168,6 +168,7 @@ to_flextable <- function(content) {
 #'
 #' @keywords internal
 custom_theme <- function(ft) {
+  checkmate::assert_class(ft, "flextable")
   ft <- flextable::fontsize(ft, size = 8, part = "body")
   ft <- flextable::bold(ft, part = "header")
   ft <- flextable::theme_booktabs(ft)
@@ -267,7 +268,7 @@ split_text_block <- function(x, n) {
 #' @noRd
 #'
 #' @keywords internal
-code_block_function <- function(code_block) {
+format_code_block_for_slide <- function(code_block) {
   df <- data.frame(code_block)
   ft <- flextable::flextable(df)
   ft <- flextable::delete_part(ft, part = "header")