diff --git a/customTargets/Common/hal/rx-mc8051-minidiy-g431cb.h b/customTargets/Common/hal/rx-mc8051-minidiy-g431cb.h
index 8e5cb0d..e19025c 100644
--- a/customTargets/Common/hal/rx-mc8051-minidiy-g431cb.h
+++ b/customTargets/Common/hal/rx-mc8051-minidiy-g431cb.h
@@ -80,6 +80,8 @@
 #define SX_DIO_EXTI_IRQHandler        EXTI3_IRQHandler
 //#define SX_DIO_EXTI_IRQ_PRIORITY    11
 
+#define SX_USE_CRYSTALOSCILLATOR
+
 void sx_init_gpio(void)
 {
     gpio_init(SX_RESET, IO_MODE_OUTPUT_PP_HIGH, IO_SPEED_VERYFAST);