diff --git a/activesupport/lib/active_support/core_ext/array/conversions.rb b/activesupport/lib/active_support/core_ext/array/conversions.rb
index 2c84329178cbd1e451cd451f8c5169a1b679c94c..b7d4434e85e453f9f28f9e756446973c49fbd237 100644
--- a/activesupport/lib/active_support/core_ext/array/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/array/conversions.rb
@@ -16,7 +16,7 @@ def to_sentence(options = {})
             when 0
               ""
             when 1
-              self[0]
+              self[0].to_s
             when 2
               "#{self[0]} #{options[:connector]}#{self[1]}"
             else
diff --git a/activesupport/test/core_ext/array_ext_test.rb b/activesupport/test/core_ext/array_ext_test.rb
index 5831e2a56a2cdc4bee8ca1f94a6f81c6230c6afa..d8ec45b62aac03acaaa64a02266aef9900a8e860 100644
--- a/activesupport/test/core_ext/array_ext_test.rb
+++ b/activesupport/test/core_ext/array_ext_test.rb
@@ -33,7 +33,6 @@ def test_plain_array_to_sentence
     assert_equal "one", ['one'].to_sentence
     assert_equal "one and two", ['one', 'two'].to_sentence
     assert_equal "one, two, and three", ['one', 'two', 'three'].to_sentence
-
   end
 
   def test_to_sentence_with_connector
@@ -57,6 +56,9 @@ def test_one_element
     assert_equal "one", ['one'].to_sentence
   end
 
+  def test_one_non_string_element
+    assert_equal '1', [1].to_sentence
+  end
 end
 
 class ArrayExtToSTests < Test::Unit::TestCase