diff --git a/ChangeLog b/ChangeLog
index f5fe0324ea..5ef5d157e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Sep  9 12:06:03 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (gc_sweep_rest): remove wrong modification of during_gc flag.
+
 Tue Sep  9 11:39:41 2014  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: pack boolean values into rb_objspace_t::flags with bit fields
diff --git a/gc.c b/gc.c
index d98241bcc1..7c34879f54 100644
--- a/gc.c
+++ b/gc.c
@@ -3309,7 +3309,6 @@ gc_sweep_rest(rb_objspace_t *objspace)
     rb_heap_t *heap = heap_eden; /* lazy sweep only for eden */
 
     if (is_lazy_sweeping(heap)) {
-	during_gc++;
 	while (is_lazy_sweeping(heap)) {
 	    gc_sweep_step(objspace, heap);
 	}