diff --git a/src/flash.c b/src/flash.c
index 426ef6c..f03de28 100644
--- a/src/flash.c
+++ b/src/flash.c
@@ -72,7 +72,7 @@ void flash_flush(void)
   _fl_addr = NO_CACHE;
 }
 
-void flash_write (uint32_t dst, const uint8_t *src, int len)
+void flash_write (uint32_t dst, const void *src, int len)
 {
   uint32_t newAddr = dst & ~(FLASH_PAGE_SIZE - 1);
 
diff --git a/src/flash.h b/src/flash.h
index a42772b..1459d4b 100644
--- a/src/flash.h
+++ b/src/flash.h
@@ -47,7 +47,7 @@
 #endif
 
 //void flash_erase(uint32_t page_addr);
-void flash_write(uint32_t dst, const uint8_t *src, int len);
+void flash_write(uint32_t dst, const void *src, int len);
 void flash_flush(void);