diff --git a/tools/test-renode.mk b/tools/test-renode.mk
index 6de2ba582..d18d7ef17 100644
--- a/tools/test-renode.mk
+++ b/tools/test-renode.mk
@@ -5,6 +5,7 @@ RENODE_UART?=$(TMP)/wolfboot.uart
 RENODE_LOG?=$(TMP)/wolfboot.log
 RENODE_PIDFILE?=$(TMP)/renode.pid
 RENODE_UPDATE_FILE=$(TMP)/renode-test-update.bin
+SIGN_ARGS=
 
 
 RENODE_PORT=55155