diff --git a/lib/ben_string.rb b/lib/ben_string.rb
index d25c021..46ca90e 100644
--- a/lib/ben_string.rb
+++ b/lib/ben_string.rb
@@ -21,9 +21,7 @@ def version(sep = '.')
   class << self
     public
       def in_use?
-        counts = Hash.new(0)
-        ObjectSpace.each_object { |o| counts[o.class] += 1 }
-        counts[self] > 0
+        ObjectSpace.each_object(self).any? { |o| self === o }
       end
   end