diff --git a/ChangeLog b/ChangeLog
index 58da152942..99c056c731 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Feb 17 23:54:29 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
+
+	* iseq.c (prepare_iseq_build): initialize iseq_compile_data::err_info
+	  with nil. this fix exception in rb_iseq_load().
+
 Thu Feb 17 22:32:35 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
 
 	* test/ruby/test_marshal.rb (test_marshal_dump_extra_iv):
diff --git a/iseq.c b/iseq.c
index f563e95e54..b821c602a3 100644
--- a/iseq.c
+++ b/iseq.c
@@ -250,6 +250,7 @@ prepare_iseq_build(rb_iseq_t *iseq,
 
     iseq->compile_data = ALLOC(struct iseq_compile_data);
     MEMZERO(iseq->compile_data, struct iseq_compile_data, 1);
+    iseq->compile_data->err_info = Qnil;
     iseq->compile_data->mark_ary = rb_ary_tmp_new(3);
 
     iseq->compile_data->storage_head = iseq->compile_data->storage_current =