diff --git a/storage/innobase/buf/buf0flu.cc b/storage/innobase/buf/buf0flu.cc
index 5df1b9e286b..32d5ba34ddb 100644
--- a/storage/innobase/buf/buf0flu.cc
+++ b/storage/innobase/buf/buf0flu.cc
@@ -854,7 +854,7 @@ buf_flush_init_for_writing(
 	ut_ad(block == NULL || block->frame == page);
 	ut_ad(block == NULL || page_zip_ == NULL
 	      || &block->page.zip == page_zip_);
-	ut_ad(!srv_safe_truncate || !block == !newest_lsn);
+	ut_ad(!srv_safe_truncate || !block || newest_lsn);
 	ut_ad(page);
 	ut_ad(!srv_safe_truncate || !newest_lsn || fil_page_get_type(page));