diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -1,4 +1,5 @@
 #include "main.h"
+#include "stm32f0xx_hal_conf.h"
 #include "usb_device.h"
 #include "ssd1306.h"
 #include "config.h"