diff --git a/common/image-fit-sig.c b/common/image-fit-sig.c
index 3e73578..a3a0c61 100644
--- a/common/image-fit-sig.c
+++ b/common/image-fit-sig.c
@@ -249,7 +249,7 @@
 				int required_keynode, int conf_noffset,
 				char **err_msgp)
 {
-	char * const exc_prop[] = {"data"};
+	char * const exc_prop[] = {"data", "data-size", "data-position"};
 	const char *prop, *end, *name;
 	struct image_sign_info info;
 	const uint32_t *strings;