diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
index 875a734b..6b8c7364 100644
--- a/lib/linguist/vendor.yml
+++ b/lib/linguist/vendor.yml
@@ -156,6 +156,9 @@
 # Ace Editor
 - (^|/)ace-builds/
 
+# Fontello CSS files
+- (^|/)fontello(.*?)\.css$
+
 # MathJax
 - (^|/)MathJax/
 
diff --git a/test/test_file_blob.rb b/test/test_file_blob.rb
index 66ef6990..82f3059c 100644
--- a/test/test_file_blob.rb
+++ b/test/test_file_blob.rb
@@ -415,6 +415,18 @@ class TestFileBlob < Minitest::Test
     assert sample_blob("ace-builds/src/ace.js").vendored?
     assert sample_blob("static/project/ace-builds/src/ace.js").vendored?
 
+    # Fontello CSS files
+    assert sample_blob("fontello.css").vendored?
+    assert sample_blob("fontello-ie7.css").vendored?
+    assert sample_blob("fontello-codes.css").vendored?
+    assert sample_blob("fontello-codes-ie7.css").vendored?
+    assert sample_blob("fontello-embedded.css").vendored?
+    assert sample_blob("assets/css/fontello.css").vendored?
+    assert sample_blob("assets/css/fontello-ie7.css").vendored?
+    assert sample_blob("assets/css/fontello-codes.css").vendored?
+    assert sample_blob("assets/css/fontello-codes-ie7.css").vendored?
+    assert sample_blob("assets/css/fontello-embedded.css").vendored?
+
     # AngularJS
     assert sample_blob("public/javascripts/angular.js").vendored?
     assert sample_blob("public/javascripts/angular.min.js").vendored?