diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
index 814ce2d2..d64c9916 100644
--- a/lib/linguist/vendor.yml
+++ b/lib/linguist/vendor.yml
@@ -16,10 +16,10 @@
 #  https://github.com/joyent/node
 - ^deps/
 - ^tools/
-- (^|/)configure
-- (^|/)configure.ac
-- (^|/)config.guess
-- (^|/)config.sub
+- (^|/)configure$
+- (^|/)configure.ac$
+- (^|/)config.guess$
+- (^|/)config.sub$
 
 # Node dependencies
 - node_modules/