diff --git a/sst49lf040.h b/sst49lf040.h
index 79dfec9..3fefe57 100644
--- a/sst49lf040.h
+++ b/sst49lf040.h
@@ -2,6 +2,6 @@
 #define __SST49LF040_H__ 1
 
 extern int erase_49lf040(struct flashchip *flash);
-extern int write_49lf040(struct flashchip *flash, unsigned char *buf);
+extern int write_49lf040(struct flashchip *flash, uint8_t *buf);
 
 #endif				/* !__SST49LF040_H__ */