diff --git a/boot/bootutil/src/bootutil_misc.c b/boot/bootutil/src/bootutil_misc.c
index 6d992b4..9fcea4e 100644
--- a/boot/bootutil/src/bootutil_misc.c
+++ b/boot/bootutil/src/bootutil_misc.c
@@ -574,7 +574,7 @@
         goto done;
     }
 
-    if (state_slot0.image_ok != erased_val) {
+    if (state_slot0.image_ok != BOOT_FLAG_UNSET) {
         /* Already confirmed. */
         goto done;
     }