diff --git a/Makefile b/Makefile
index 04b75db..28c710c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,14 @@
 all:
-	r -e 'bookdown::render_book()'
+	Rscript -e 'bookdown::render_book()'
 
 pdf:
-	r -e 'bookdown::render_book("index.Rmd", "bookdown::pdf_book")'
+	Rscript -e 'bookdown::render_book("index.Rmd", "bookdown::pdf_book")'
 
 doc:
-	r -e 'bookdown::render_book("index.Rmd", "bookdown::word_document2")'
+	Rscript -e 'bookdown::render_book("index.Rmd", "bookdown::word_document2")'
 
 serve:
-	r -e 'bookdown::serve_book()'
+	Rscript -e 'bookdown::serve_book()'
 
 clean:
 	rm -rf _book _bookdown_files