diff --git a/lib/threadsafe_attr.rb b/lib/threadsafe_attr.rb
index fdd1429..462e786 100644
--- a/lib/threadsafe_attr.rb
+++ b/lib/threadsafe_attr.rb
@@ -9,13 +9,13 @@ def threadsafe_attr_accessor(*attrs)
   private
   def reader(attr)
     define_method(attr) do
-      Thread.current["#{self.name}.#{attr}"]
+      Thread.current.thread_variable_get("#{self.name}.#{attr}")
     end
   end
 
   def writer(attr)
     define_method("#{attr}=") do |value|
-      Thread.current["#{self.name}.#{attr}"] = value
+      Thread.current.thread_variable_set("#{self.name}.#{attr}", value)
     end
   end
 end