diff --git a/flashchips.c b/flashchips.c
index 8a6f174..90a096f 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -2881,7 +2881,7 @@
 		.model_id	= W_39V040B,
 		.total_size	= 512,
 		.page_size	= 64*1024,
-		.tested		= TEST_OK_PREW,
+		.tested		= TEST_OK_PR | TEST_BAD_ERASE | TEST_BAD_WRITE,
 		.probe		= probe_jedec,
 		.probe_timing	= 10, 
 		.erase		= erase_chip_jedec,