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@@ -105,10 +105,13 @@ class Module
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     end
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   end
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-  RESTRICTED = %w(inspect __send__ __id__)
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+  RESTRICTED_CLASSES = [String, (class << Benchmark; self; end), Benchmark]
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+  RESTRICTED_METHODS = %w(inspect __send__ __id__)
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   def instrumented?(meth)
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-    RESTRICTED.include?(meth.to_s) || meth =~ /__instrumented$/ ||
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+    RESTRICTED_CLASSES.include?(self) ||
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+      RESTRICTED_METHODS.include?(meth.to_s) ||
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+      meth =~ /__instrumented$/ ||
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       instance_methods.include?("#{__stickshift_mangle(meth)}__instrumented")
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   end
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@@ -29,7 +29,16 @@ class Bar
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   end
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 end
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+module TestHelper
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+  def instrumented_name(meth)
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+    Module.__stickshift_mangle(meth) + '__instrumented'
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+  end
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+  module_function :instrumented_name
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+end
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+
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 class StickshiftTest < Test::Unit::TestCase
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+  include TestHelper
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+
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   def capture
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     Stickshift.output = @stdout = StringIO.new
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     @out = nil
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@@ -126,10 +135,6 @@ class StickshiftTest < Test::Unit::TestCase
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     assert @stdout.string =~ /Bar#slow_method.*Foo#slow_method/m
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   end
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-  def instrumented_name(meth)
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-    Module.__stickshift_mangle(meth) + '__instrumented'
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-  end
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-
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   def test_cannot_instrument_instrumented_methods
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     Foo.instrument :slow_method
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     assert Foo.instrumented?(:slow_method)
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@@ -145,4 +150,13 @@ class StickshiftTest < Test::Unit::TestCase
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       assert !Foo.instance_methods.include?(instrumented_name(m))
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     end
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   end
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+
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+  def test_cannot_instrument_string_or_benchmark_methods
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+    String.instrument :to_s
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+    assert !String.instance_methods.include?(instrumented_name(:to_s))
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+    assert ! class << Benchmark;
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+      instrument :realtime
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+      self.instance_methods.include?(TestHelper::instrumented_name(:realtime))
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+    end
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+  end
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 end