diff --git a/.Rbuildignore b/.Rbuildignore
index 548f11c..740b69e 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -1,6 +1,6 @@
 LICENSE
 TODO.md
-matlab
+^matlab
 CHANGELOG.md
 CITATION.cff
 .travis.yml