diff --git a/Images/tap-v1.prototype b/Images/tap-v1.prototype
index 806b59fc71..3e31b74370 100644
--- a/Images/tap-v1.prototype
+++ b/Images/tap-v1.prototype
@@ -7,6 +7,7 @@
     "summary": "TAPv1",
     "version": "0.1",
     "image_size": 0,
+    "image_maxsize": 999424,
     "git_identity": "",
     "board_revision": 0
 }