diff --git a/lib/couchrest/mixins/properties.rb b/lib/couchrest/mixins/properties.rb
index 21e9ca2..bfd6f15 100644
--- a/lib/couchrest/mixins/properties.rb
+++ b/lib/couchrest/mixins/properties.rb
@@ -58,6 +58,10 @@ module CouchRest
           key = self.has_key?(property.name) ? property.name : property.name.to_sym
           # Don't cast the property unless it has a value
           next if (value = self[key]).nil?
+          # Don't cast the property if it is not accessible
+          if self.class.respond_to? :accessible_properties
+            next if self.class.accessible_properties.index(key).nil?
+          end
           write_property(property, value)
         end
       end
diff --git a/spec/couchrest/more/property_spec.rb b/spec/couchrest/more/property_spec.rb
index a98e1a9..9156795 100644
--- a/spec/couchrest/more/property_spec.rb
+++ b/spec/couchrest/more/property_spec.rb
@@ -175,8 +175,9 @@ describe "ExtendedDocument properties" do
         @course['participants'].should eql([{}, 'q', 1])
       end
 
-      it "should cast end_date to Date" do
-        @event['end_date'].should be_an_instance_of(Date)
+      it "should cast started_on to Date" do
+        @course.started_on = Date.today
+        @course['started_on'].should be_an_instance_of(Date)
       end
     end