diff --git a/lib/jekyll/filters/grouping_filters.rb b/lib/jekyll/filters/grouping_filters.rb
index a16901d9..f2c03466 100644
--- a/lib/jekyll/filters/grouping_filters.rb
+++ b/lib/jekyll/filters/grouping_filters.rb
@@ -40,7 +40,7 @@ module Jekyll
 
       private
       def parse_expression(str)
-        Liquid::Variable.new(str, {})
+        Liquid::Variable.new(str, Liquid::ParseContext.new)
       end
 
       private