diff --git a/app/models/content_instance.rb b/app/models/content_instance.rb
index 7f4a289e..527c76ba 100644
--- a/app/models/content_instance.rb
+++ b/app/models/content_instance.rb
@@ -52,11 +52,11 @@ class ContentInstance
   end
   
   def next
-    content_type.contents.where(_position_in_list: _position_in_list + 1).first()
+    content_type.contents.where(:_position_in_list => _position_in_list + 1).first()
   end
   
   def previous
-    content_type.contents.where(_position_in_list: _position_in_list - 1).first()
+    content_type.contents.where(:_position_in_list => _position_in_list - 1).first()
   end
 
   def errors_to_hash