diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
index 48a4fe44..5ab1bb67 100644
--- a/lib/linguist/vendor.yml
+++ b/lib/linguist/vendor.yml
@@ -90,7 +90,7 @@
 - ^[Pp]ackages/
 
 # ExtJS
-- (^|/)ext(js)?(-\d\.\d\.\d)?(-gpl)?/
+- (^|/)extjs/
 
 # Samples folders
 - ^[Ss]amples/
diff --git a/test/test_blob.rb b/test/test_blob.rb
index 0f35465b..56189134 100644
--- a/test/test_blob.rb
+++ b/test/test_blob.rb
@@ -181,6 +181,7 @@ class TestBlob < Test::Unit::TestCase
 
   def test_vendored
     assert !blob("README").vendored?
+    assert !blob("ext/extconf.rb").vendored?
 
     # Node depedencies
     assert blob("node_modules/coffee-script/lib/coffee-script.js").vendored?