diff --git a/ChangeLog b/ChangeLog
index f9dc87de0d..9b9e81c079 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,8 @@
-Mon Dec  9 12:25:32 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Mon Dec  9 12:26:05 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/objspace/object_tracing.c (newobj_i): use cached class path
+	  only to get rid object allocation during NEWOBJ hook.
+	  [ruby-core:58853] [Bug #9212]
 
 	* variable.c (rb_class_path_cached): returns cached class path
 	  only, without searching and allocating new class path string.
diff --git a/ext/objspace/object_tracing.c b/ext/objspace/object_tracing.c
index ff45172af4..0ffdafb520 100644
--- a/ext/objspace/object_tracing.c
+++ b/ext/objspace/object_tracing.c
@@ -81,7 +81,7 @@ newobj_i(VALUE tpval, void *data)
     VALUE klass = rb_tracearg_defined_class(tparg);
     struct allocation_info *info;
     const char *path_cstr = RTEST(path) ? make_unique_str(arg->str_table, RSTRING_PTR(path), RSTRING_LEN(path)) : 0;
-    VALUE class_path = (RTEST(klass) && !OBJ_FROZEN(klass)) ? rb_class_path(klass) : Qnil;
+    VALUE class_path = (RTEST(klass) && !OBJ_FROZEN(klass)) ? rb_class_path_cached(klass) : Qnil;
     const char *class_path_cstr = RTEST(class_path) ? make_unique_str(arg->str_table, RSTRING_PTR(class_path), RSTRING_LEN(class_path)) : 0;
 
     if (st_lookup(arg->object_table, (st_data_t)obj, (st_data_t *)&info)) {