diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
index 53f66bc0..843b5433 100644
--- a/lib/linguist/vendor.yml
+++ b/lib/linguist/vendor.yml
@@ -184,5 +184,5 @@
 - .[Dd][Ss]_[Ss]tore$
 
 # R packages
-- vignettes/
-- inst/extdata/
+- ^vignettes/
+- ^inst/extdata/