diff --git a/lib/ionicons-rails.rb b/lib/ionicons-rails.rb
index d3fc17b..a5b7787 100644
--- a/lib/ionicons-rails.rb
+++ b/lib/ionicons-rails.rb
@@ -2,7 +2,9 @@ module Ionicons
   module Rails
     class Engine < ::Rails::Engine
       initializer "ionicons-rails.assets.precompile" do |app|
-        app.config.assets.precompile << %r(ionicons\.(?:eot|svg|ttf|woff)$)
+        unless Sprockets::Rails::VERSION.starts_with?('3')
+         app.config.assets.precompile << %r(ionicons\.(?:eot|svg|ttf|woff)$)
+       end
       end
     end
   end