diff --git a/lib/draper/collection_decorator.rb b/lib/draper/collection_decorator.rb
index e5d9aae..2710b17 100644
--- a/lib/draper/collection_decorator.rb
+++ b/lib/draper/collection_decorator.rb
@@ -3,9 +3,11 @@ module Draper
     include Enumerable
     include ViewHelpers
 
-    attr_accessor :source, :context
+    attr_reader :source
     alias_method :to_source, :source
 
+    attr_accessor :context
+
     array_methods = Array.instance_methods - Object.instance_methods
     delegate :as_json, *array_methods, to: :decorated_collection
 
diff --git a/lib/draper/decorator.rb b/lib/draper/decorator.rb
index 999a3e3..979b883 100755
--- a/lib/draper/decorator.rb
+++ b/lib/draper/decorator.rb
@@ -5,11 +5,12 @@ module Draper
     include Draper::ViewHelpers
     include ActiveModel::Serialization if defined?(ActiveModel::Serialization)
 
-    attr_accessor :source, :context
-
+    attr_reader :source
     alias_method :model, :source
     alias_method :to_source, :source
 
+    attr_accessor :context
+
     # Initialize a new decorator instance by passing in
     # an instance of the source class. Pass in an optional
     # :context inside the options hash which is available
@@ -257,8 +258,8 @@ module Draper
 
     def handle_multiple_decoration(options)
       if source.instance_of?(self.class)
-        self.context = source.context unless options.has_key?(:context)
-        self.source = source.source
+        @context = source.context unless options.has_key?(:context)
+        @source = source.source
       elsif source.decorated_with?(self.class)
         warn "Reapplying #{self.class} decorator to target that is already decorated with it. Call stack:\n#{caller(1).join("\n")}"
       end