diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index 71ac3e3a8539..8f23825e442f 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -1358,6 +1358,7 @@ vm_object_split(vm_map_entry_t entry)
 	vm_object_t orig_object, new_object, source;
 	vm_pindex_t idx, offidxstart;
 	vm_size_t size;
+	objtype_t type;
 
 	orig_object = entry->object.vm_object;
 	if (orig_object->type != OBJT_DEFAULT && orig_object->type != OBJT_SWAP)
@@ -1411,6 +1412,7 @@ vm_object_split(vm_map_entry_t entry)
 		    ("orig_object->charge < 0"));
 		orig_object->charge -= ptoa(size);
 	}
+	type = orig_object->type;
 retry:
 	m = vm_page_find_least(orig_object, offidxstart);
 	for (; m != NULL && (idx = m->pindex - offidxstart) < size;
@@ -1462,6 +1464,9 @@ vm_object_split(vm_map_entry_t entry)
 			vm_page_xbusy(m);
 	}
 	if (orig_object->type == OBJT_SWAP) {
+		if (type != orig_object->type)
+			printf("warning: object type changed while sleeping\n");
+
 		/*
 		 * swap_pager_copy() can sleep, in which case the orig_object's
 		 * and new_object's locks are released and reacquired.