diff --git a/lib/parfait/list.rb b/lib/parfait/list.rb
index 95b4b8a9..b8c99781 100644
--- a/lib/parfait/list.rb
+++ b/lib/parfait/list.rb
@@ -24,7 +24,7 @@ module Parfait
     def index_of( item )
       max = self.get_length
       counter = 1
-      while( counter < max )
+      while( counter <= max )
         if( get(counter) == item)
           return counter
         end
diff --git a/test/parfait/test_list.rb b/test/parfait/test_list.rb
index cd5bac37..4ba8eb4b 100644
--- a/test/parfait/test_list.rb
+++ b/test/parfait/test_list.rb
@@ -52,6 +52,7 @@ class TestList < MiniTest::Test
   def test_index_of
     test_many_get
     assert_equal 2 , @list.index_of( :two )
+    assert_equal 3 , @list.index_of( :three )
     assert_equal nil , @list.index_of( :four )
   end
   def test_incude