diff --git a/core_dev_sign_update b/core_dev_sign_update
index 46704653a4..d08b9a5c71 100755
--- a/core_dev_sign_update
+++ b/core_dev_sign_update
@@ -6,7 +6,7 @@ SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
 assert_inside_chroot
 
 DEFINE_string data_dir "" "Directory containing downloaded release artifacts"
-DEFINE_string board "" "Board to sign artifacts for"
+DEFINE_string board "amd64-usr" "Board to sign artifacts for"
 DEFINE_string version "" "Version to sign artifacts for"
 DEFINE_integer n_signatures "2" "Number of signatures this release will be signed with"
 DEFINE_string output_dir "" "Output directory"