diff --git a/ChangeLog b/ChangeLog
index 14afc55512..9aefa55fe9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Apr 28 17:40:15 2014  Narihiro Nakamura  <authornari@gmail.com>
+
+	* gc.c: Fix typos. These are undefined variables.
+
 Sun Apr 27 19:39:42 2014  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* ext/date/date_strptime.c (date__strptime_internal): do not
diff --git a/gc.c b/gc.c
index 29e75a8e51..ae5b634e38 100644
--- a/gc.c
+++ b/gc.c
@@ -6229,7 +6229,7 @@ objspace_xrealloc(rb_objspace_t *objspace, void *ptr, size_t new_size, size_t ol
 #if CALC_EXACT_MALLOC_SIZE
     new_size += sizeof(size_t);
     ptr = (size_t *)ptr - 1;
-    oldsize = ((size_t *)ptr)[0];
+    old_size = ((size_t *)ptr)[0];
 #endif
 
     old_size = objspace_malloc_size(objspace, ptr, old_size);
@@ -6251,7 +6251,7 @@ objspace_xfree(rb_objspace_t *objspace, void *ptr, size_t old_size)
 {
 #if CALC_EXACT_MALLOC_SIZE
     ptr = ((size_t *)ptr) - 1;
-    oldsize = ((size_t*)ptr)[0];
+    old_size = ((size_t*)ptr)[0];
 #endif
     old_size = objspace_malloc_size(objspace, ptr, old_size);