diff --git a/ChangeLog b/ChangeLog
index a3dfdb2802..5dea9355e2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Dec 14 01:15:51 2013  Masaya Tarui  <tarui@ruby-lang.org>
+
+	* gc.c (wmap_final_func): Bugfix. Should update *value to new pointer.
+
 Sat Dec 14 01:05:46 2013  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/lib/socket.rb: Don't test $! in "ensure" clause because
diff --git a/gc.c b/gc.c
index 3d5aade54e..03c755dac8 100644
--- a/gc.c
+++ b/gc.c
@@ -6330,6 +6330,7 @@ wmap_final_func(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
     if (j < i) {
 	ptr = ruby_sized_xrealloc2(ptr, j, sizeof(VALUE), i);
 	ptr[0] = j;
+	*value = (st_data_t)ptr;
     }
     return ST_CONTINUE;
 }