diff --git a/include/image-commands.mk b/include/image-commands.mk
index 1ec5252972..8db046bdea 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -281,7 +281,7 @@ metadata_json = \
 	}'
 
 define Build/append-metadata
-	$(if $(SUPPORTED_DEVICES),echo $(call metadata_json,$(SUPPORTED_DEVICES)) | fwtool -I - $@)
+	$(if $(SUPPORTED_DEVICES),-echo $(call metadata_json,$(SUPPORTED_DEVICES)) | fwtool -I - $@)
 endef
 
 define Build/kernel2minor