diff --git a/ChangeLog b/ChangeLog
index 8991b8d322..055beb52dd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jan 31 13:31:43 2010  wanabe  <s.wanabe@gmail.com>
+
+	* gc.c (obj_free): free rb_classext_t of eigenclass.  [Bug #1392]
+
 Sun Jan 31 13:00:14 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* lib/rexml/document.rb (REXML::Document#add): fix duplicate XMLDecls
diff --git a/gc.c b/gc.c
index 40212204a3..931546ee04 100644
--- a/gc.c
+++ b/gc.c
@@ -2047,6 +2047,7 @@ obj_free(rb_objspace_t *objspace, VALUE obj)
 	break;
       case T_ICLASS:
 	/* iClass shares table with the module */
+	xfree(RANY(obj)->as.klass.ptr);
 	break;
 
       case T_FLOAT: