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-rw-r--r--include/image-commands.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/image-commands.mk b/include/image-commands.mk
index 01040138a4..f7e6ba6aa6 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -309,7 +309,7 @@ metadata_json = \
define Build/append-metadata
$(if $(SUPPORTED_DEVICES),-echo $(call metadata_json,$(SUPPORTED_DEVICES)) | fwtool -I - $@)
- [ -s "$(BUILD_KEY)" -a -s "$(BUILD_KEY).ucert" ] && { \
+ [ ! -s "$(BUILD_KEY)" -o ! -s "$(BUILD_KEY).ucert" ] || { \
cp "$(BUILD_KEY).ucert" "$@.ucert" ;\
usign -S -m "$@" -s "$(BUILD_KEY)" -x "$@.sig" ;\
ucert -A -c "$@.ucert" -x "$@.sig" ;\