diff --git a/ChangeLog b/ChangeLog
index 4e8eb2aacd..55f97bbc87 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Jun  4 04:04:41 2011  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* test/rubygems/test_gem_commands_which_command.rb:
+	  "missing" exists on ruby's top source directory. [Bug #4815]
+
 Fri Jun  3 21:48:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* lib/rubygems/test_case.rb: Refix for test-all in separate directory.
diff --git a/test/rubygems/test_gem_commands_which_command.rb b/test/rubygems/test_gem_commands_which_command.rb
index 7a21f7cc05..5e42debb74 100644
--- a/test/rubygems/test_gem_commands_which_command.rb
+++ b/test/rubygems/test_gem_commands_which_command.rb
@@ -33,19 +33,19 @@ class TestGemCommandsWhichCommand < Gem::TestCase
 
     util_foo_bar
 
-    @cmd.handle_options %w[foo_bar missing]
+    @cmd.handle_options %w[foo_bar missinglib]
 
     use_ui @ui do
       @cmd.execute
     end
 
     assert_equal "#{@foo_bar.full_gem_path}/lib/foo_bar.rb\n", @ui.output
-    assert_match %r%Can.t find ruby library file or shared library missing\n%,
+    assert_match %r%Can.t find ruby library file or shared library missinglib\n%,
                  @ui.error
   end
 
   def test_execute_missing
-    @cmd.handle_options %w[missing]
+    @cmd.handle_options %w[missinglib]
 
     use_ui @ui do
       assert_raises Gem::MockGemUi::TermError do
@@ -54,7 +54,7 @@ class TestGemCommandsWhichCommand < Gem::TestCase
     end
 
     assert_equal '', @ui.output
-    assert_match %r%Can.t find ruby library file or shared library missing\n%,
+    assert_match %r%Can.t find ruby library file or shared library missinglib\n%,
                  @ui.error
   end