diff --git a/src/W800_SDK_v1.00.10/app/app_utils/app_utils.c b/src/W800_SDK_v1.00.10/app/app_utils/app_utils.c
index 3cdd077..eb0bf98 100644
--- a/src/W800_SDK_v1.00.10/app/app_utils/app_utils.c
+++ b/src/W800_SDK_v1.00.10/app/app_utils/app_utils.c
@@ -78,7 +78,7 @@ uint32_t random_gen_6_digit(void)
 	unsigned char random_buf[6] = {0};
 	uint32_t output_num = 0;
 
-	tls_crypto_random_init(0x19031998, CRYPTO_RNG_SWITCH_16);
+	tls_crypto_random_init(elapsed_ms(), CRYPTO_RNG_SWITCH_16);
 	tls_crypto_random_bytes(random_buf, sizeof random_buf);
 	tls_crypto_random_stop();