diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index f215e0b8..2e4a1174 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -328,7 +328,7 @@ module Jekyll
 
     def as_liquid(item)
       case item
-      when String, Numeric, nil
+      when String, Numeric, true, false, nil
         item.to_liquid
       when Hash
         Hash[item.map { |k, v| [as_liquid(k), as_liquid(v)] }]
diff --git a/test/test_filters.rb b/test/test_filters.rb
index 7325e90e..d46d9352 100644
--- a/test/test_filters.rb
+++ b/test/test_filters.rb
@@ -155,18 +155,18 @@ class TestFilters < Test::Unit::TestCase
       end
       class T < Struct.new(:name)
         def to_liquid
-          { "name" => name, :v => 1, :thing => M.new({:kay => "jewelers"}) }
+          { "name" => name, :v => 1, :thing => M.new({:kay => "jewelers"}), :stuff => true }
         end
       end
 
       should "call #to_liquid " do
-        expected = "[{\"name\":\"Jeremiah\",\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}]},{\"name\":\"Smathers\",\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}]}]"
+        expected = "[{\"name\":\"Jeremiah\",\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}],\"stuff\":true},{\"name\":\"Smathers\",\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}],\"stuff\":true}]"
         assert_equal expected, @filter.jsonify([T.new("Jeremiah"), T.new("Smathers")])
       end
 
       should "handle hashes with all sorts of weird keys and values" do
         my_hash = { "posts" => Array.new(5) { |i| T.new(i) } }
-        expected = "{\"posts\":[{\"name\":0,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}]},{\"name\":1,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}]},{\"name\":2,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}]},{\"name\":3,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}]},{\"name\":4,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}]}]}"
+        expected = "{\"posts\":[{\"name\":0,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}],\"stuff\":true},{\"name\":1,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}],\"stuff\":true},{\"name\":2,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}],\"stuff\":true},{\"name\":3,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}],\"stuff\":true},{\"name\":4,\"v\":1,\"thing\":[{\"kay\":\"jewelers\"}],\"stuff\":true}]}"
         assert_equal expected, @filter.jsonify(my_hash)
       end
     end