diff --git a/sst_fwhub.h b/sst_fwhub.h
index eb2b364..66979bc 100644
--- a/sst_fwhub.h
+++ b/sst_fwhub.h
@@ -3,6 +3,6 @@
 
 extern int probe_sst_fwhub(struct flashchip *flash);
 extern int erase_sst_fwhub(struct flashchip *flash);
-extern int write_sst_fwhub(struct flashchip *flash, unsigned char *buf);
+extern int write_sst_fwhub(struct flashchip *flash, uint8_t *buf);
 
 #endif				/* !__SST_FWHUB_H__ */