diff --git a/spell-check.R b/spell-check.R
index 56f63be..ef35f53 100644
--- a/spell-check.R
+++ b/spell-check.R
@@ -1,4 +1,4 @@
-#!/usr/bin/env Rscript
+#!/usr/bin/env Rscript --vanilla
 #
 # Run spell check and save results.
 # By default, all R Markdown and markdown files will be checked.