diff --git a/lib/jbuilder.rb b/lib/jbuilder.rb
index 1759a485..c454ae73 100644
--- a/lib/jbuilder.rb
+++ b/lib/jbuilder.rb
@@ -126,7 +126,7 @@ def method_missing(method, *args)
 
       # json.age 32
       # { "age": 32 }
-      when args.one?
+      when args.length == 1
         set! method, args.first
 
       # json.comments { |json| ... }
@@ -182,4 +182,4 @@ def _inline_extract(container, record, attributes)
     end
 end
 
-require "jbuilder_template" if defined?(ActionView::Template)
\ No newline at end of file
+require "jbuilder_template" if defined?(ActionView::Template)
diff --git a/test/jbuilder_test.rb b/test/jbuilder_test.rb
index 7af41743..b1c7be31 100644
--- a/test/jbuilder_test.rb
+++ b/test/jbuilder_test.rb
@@ -12,6 +12,23 @@ class JbuilderTest < ActiveSupport::TestCase
     assert_equal "hello", JSON.parse(json)["content"]
   end
 
+  test "single key with false value" do
+    json = Jbuilder.encode do |json|
+      json.content false
+    end
+
+    assert_equal false, JSON.parse(json)["content"]
+  end
+
+  test "single key with nil value" do
+    json = Jbuilder.encode do |json|
+      json.content nil
+    end
+
+    assert JSON.parse(json).has_key?("content")
+    assert_equal nil, JSON.parse(json)["content"]
+  end
+
   test "multiple keys" do
     json = Jbuilder.encode do |json|
       json.title "hello"
@@ -225,4 +242,4 @@ def initialize(name, age)
     
     assert_equal "stuff", JSON.parse(json)["each"]
   end
-end
\ No newline at end of file
+end