diff --git a/lib/react/rails/engine.rb b/lib/react/rails/engine.rb
index 7af1f8c5..aef68a40 100644
--- a/lib/react/rails/engine.rb
+++ b/lib/react/rails/engine.rb
@@ -2,7 +2,8 @@ module React
   module Rails
     class Engine < ::Rails::Engine
       initializer "react_rails.setup_engine", :group => :all do |app|
-        app.assets.register_engine '.jsx', React::JSX::Template
+        sprockets_env = app.assets || Sprockets # Sprockets 3.x expects this in a different place
+        sprockets_env.register_engine(".jsx", React::JSX::Template)
       end
     end
   end
diff --git a/lib/react/rails/railtie.rb b/lib/react/rails/railtie.rb
index a5283c22..e372f4af 100644
--- a/lib/react/rails/railtie.rb
+++ b/lib/react/rails/railtie.rb
@@ -38,10 +38,9 @@ class Railtie < ::Rails::Railtie
           addons: app.config.react.addons,
         })
 
-        app.assets.version = [
-          app.assets.version,
-          "react-#{asset_variant.react_build}",
-        ].compact.join('-')
+        sprockets_env = app.assets || app.config.assets # sprockets-rails 3.x attaches this at a different config
+        sprockets_env.version = [sprockets_env.version, "react-#{asset_variant.react_build}",].compact.join('-')
+
       end
 
       config.before_initialize do |app|