diff --git a/gc.c b/gc.c
index 0adef25312e0b3..8583ee1a6d088a 100644
--- a/gc.c
+++ b/gc.c
@@ -1595,7 +1595,11 @@ rb_objspace_free_objects(void *objspace)
 int
 rb_objspace_garbage_object_p(VALUE obj)
 {
-    return rb_gc_impl_garbage_object_p(rb_gc_get_objspace(), obj);
+    void *objspace = rb_gc_get_objspace();
+    if (!rb_gc_impl_pointer_to_heap_p(objspace, (void *)obj)) {
+        return TRUE;
+    }
+    return rb_gc_impl_garbage_object_p(objspace, obj);
 }
 
 /*