diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
index 135f367c..965e7d32 100644
--- a/lib/linguist/vendor.yml
+++ b/lib/linguist/vendor.yml
@@ -182,3 +182,6 @@
 
 # .DS_Store's
 - .[Dd][Ss]_[Ss]tore$
+
+# Mercury --use-subdirs
+- Mercury/