diff --git a/flash.h b/flash.h
--- a/flash.h
+++ b/flash.h
@@ -2,6 +2,7 @@
 #define FLASH_H
 
 #include "states.h"
+#include "stm32f0xx_hal_flash.h"
 
 #define PAGE_SIZE ((uint16_t)0x400)
 #define END_ADDR 0x08007FFF