diff --git a/lib/librato/metrics/smart_json.rb b/lib/librato/metrics/smart_json.rb
index d146890..136cb02 100644
--- a/lib/librato/metrics/smart_json.rb
+++ b/lib/librato/metrics/smart_json.rb
@@ -1,8 +1,6 @@
 module Librato
   module Metrics
     class SmartJSON
-      extend SingleForwardable
-
       if defined?(::MultiJson)
         def self.read(json)
           # MultiJSON >= 1.3.0