diff --git a/skynet-src/skynet_main.c b/skynet-src/skynet_main.c
index cbb4e0b2..40b13acc 100644
--- a/skynet-src/skynet_main.c
+++ b/skynet-src/skynet_main.c
@@ -39,6 +39,7 @@ optstring(const char *key,const char * opt) {
 	if (str == NULL) {
 		if (opt) {
 			skynet_setenv(key, opt);
+			opt = skynet_getenv(key);
 		}
 		return opt;
 	}