diff --git a/ChangeLog b/ChangeLog
index dca8c57784..69901a619c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Sep  1 18:50:50 2012  Akinori MUSHA  <knu@iDaemons.org>
+
+	* lib/set.rb (#initialize_copy, #eql): Use instance_variable_get
+	  instead of instance_eval.
+
 Fri Aug 31 21:47:56 2012  Kouhei Sutou  <kou@cozmixng.org>
 
 	* lib/test/unit/test-unit.gemspec: Make test/unit default gem.
diff --git a/lib/set.rb b/lib/set.rb
index 19bb892feb..87a941e565 100755
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -96,7 +96,7 @@ class Set
 
   # Copy internal hash.
   def initialize_copy(orig)
-    @hash = orig.instance_eval{@hash}.dup
+    @hash = orig.instance_variable_get(:@hash).dup
   end
 
   def freeze    # :nodoc:
@@ -384,7 +384,7 @@ class Set
 
   def eql?(o)   # :nodoc:
     return false unless o.is_a?(Set)
-    @hash.eql?(o.instance_eval{@hash})
+    @hash.eql?(o.instance_variable_get(:@hash))
   end
 
   # Classifies the set by the return value of the given block and