diff --git a/lib/linguist/generated.rb b/lib/linguist/generated.rb
index 534ed798..4bbea954 100644
--- a/lib/linguist/generated.rb
+++ b/lib/linguist/generated.rb
@@ -53,6 +53,7 @@ module Linguist
     def generated?
       name == 'Gemfile.lock' ||
         minified_javascript? ||
+        minified_css? ||
         compiled_coffeescript? ||
         xcode_project_file? ||
         generated_net_docfile? ||
@@ -85,6 +86,21 @@ module Linguist
       end
     end
 
+    # Internal: Is the blob minified CSS?
+    #
+    # Consider CSS minified if the average line length is
+    # greater than 100c.
+    #
+    # Returns true or false.
+    def minified_css?
+      return unless extname == '.css'
+      if lines.any?
+        (lines.inject(0) { |n, l| n += l.length } / lines.length) > 100
+      else
+        false
+      end
+    end
+
     # Internal: Is the blob of JS generated by CoffeeScript?
     #
     # CoffeeScript is meant to output JS that would be difficult to