diff --git a/src/main.c b/src/main.c
index 57c4396..ec334a3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -109,7 +109,7 @@ void usb_teardown(void);
 #define DFU_DBL_RESET_MEM               0x20007F7C
 
 #define BOOTLOADER_VERSION_REGISTER     NRF_TIMER2->CC[0]
-#define DFU_SERIAL_STARTUP_INTERVAL     1000
+#define DFU_SERIAL_STARTUP_INTERVAL     3000
 
 // These value must be the same with one in dfu_transport_ble.c
 #define BLEGAP_EVENT_LENGTH             6