diff --git a/scripts/target_config_lib.lua b/scripts/target_config_lib.lua
index 4c5be357..443df3a7 100644
--- a/scripts/target_config_lib.lua
+++ b/scripts/target_config_lib.lua
@@ -7,7 +7,7 @@ return function(funcs)
 
 	local target = arg[1]
 	local default_packages = arg[2]
-	local extra_packages = arg[3]
+	local extra_packages = arg[3] or ""
 
 	local openwrt_config_target
 	if env.SUBTARGET ~= '' then