diff --git a/pm49fl004.c b/pm49fl004.c
index afcd55a..baa80a8 100644
--- a/pm49fl004.c
+++ b/pm49fl004.c
@@ -29,12 +29,12 @@
 
 extern int exclude_start_page, exclude_end_page;
 
-int write_49fl004(struct flashchip *flash, unsigned char *buf)
+int write_49fl004(struct flashchip *flash, uint8_t *buf)
 {
 	int i;
 	int total_size = flash->total_size * 1024, page_size =
 		flash->page_size;
-	volatile char *bios = flash->virt_addr;
+	volatile uint8_t *bios = flash->virt_addr;
 	
 	printf("Programming Page: ");
 	for (i = 0; i < total_size / page_size; i++) {