diff --git a/main/ble_spp_server_demo.c b/main/ble_spp_server_demo.c
index ab49f5e..dff2410 100644
--- a/main/ble_spp_server_demo.c
+++ b/main/ble_spp_server_demo.c
@@ -31,7 +31,7 @@ static bluetooth_processer_t *g_bluetooth_processer;
 #define ESP_GATT_UUID_SPP_HEARTBEAT 0xABF5
 #endif
 
-static const uint8_t spp_adv_data[23] = {
+static const uint8_t spp_adv_data[18] = {
     /* Flags */
     0x02, 0x01, 0x06,
     /* Complete List of 16-bit Service Class UUIDs */