diff --git a/package/base-files/files/lib/upgrade/fwtool.sh b/package/base-files/files/lib/upgrade/fwtool.sh
index 3f28fccd90..6d7300bad6 100644
--- a/package/base-files/files/lib/upgrade/fwtool.sh
+++ b/package/base-files/files/lib/upgrade/fwtool.sh
@@ -9,7 +9,7 @@ fwtool_check_signature() {
 		fi
 	}
 
-	if ! fwtool -q -t -s /tmp/sysupgrade.ucert "$1"; then
+	if ! fwtool -q -s /tmp/sysupgrade.ucert "$1"; then
 		echo "Image signature not found"
 		[ "$REQUIRE_IMAGE_SIGNATURE" = 1 -a "$FORCE" != 1 ] && {
 			echo "Use sysupgrade -F to override this check when downgrading or flashing to vendor firmware"