diff --git a/configs/ACCIF405/config.h b/configs/ACCIF405/config.h
index 54d6bc5ab..bb8a470ba 100644
--- a/configs/ACCIF405/config.h
+++ b/configs/ACCIF405/config.h
@@ -142,6 +142,7 @@
 #define DEFAULT_VOLTAGE_METER_SCALE     102
 #define DEFAULT_DSHOT_BURST DSHOT_DMAR_OFF
 #define DEFAULT_DSHOT_BITBANG DSHOT_BITBANG_OFF
+#define SYSTEM_HSE_MHZ 8
 
 // DISABLED
 // #define INVERTER_PIN_UART1   PC0