diff --git a/lib/linguist/heuristics.rb b/lib/linguist/heuristics.rb
index 3912ac5c..75ce74f2 100644
--- a/lib/linguist/heuristics.rb
+++ b/lib/linguist/heuristics.rb
@@ -1,7 +1,7 @@
 module Linguist
   # A collection of simple heuristics that can be used to better analyze languages.
   class Heuristics
-    ACTIVE = false
+    ACTIVE = true
 
     # Public: Given an array of String language names,
     # apply heuristics against the given data and return an array