1 files changed, 9 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index 14779fb20b..c2e015dc6b 100644
--- a/gc.c
+++ b/gc.c
@@ -4984,6 +4984,15 @@ void
 rb_gc_writebarrier_remember_promoted(VALUE obj)
 {
     rb_objspace_t *objspace = &rb_objspace;
+
+    if (RGENGC_CHECK_MODE) {
+	if (!RVALUE_PROMOTED_P(obj)) rb_bug("rb_gc_writebarrier_remember_promoted: called on non-promoted object");
+    }
+
+#if RGENGC_AGE2_PROMOTION
+    if (!RVALUE_OLD_P(obj)) return;
+#endif
+
     rgengc_remember(objspace, obj);
 }