diff --git a/drivers/tty/mips_ejtag_fdc.c b/drivers/tty/mips_ejtag_fdc.c
index afbf7738c7c4..58b28be63c79 100644
--- a/drivers/tty/mips_ejtag_fdc.c
+++ b/drivers/tty/mips_ejtag_fdc.c
@@ -1154,7 +1154,7 @@ static char kgdbfdc_rbuf[4];
 
 /* write buffer to allow compaction */
 static unsigned int kgdbfdc_wbuflen;
-static char kgdbfdc_wbuf[4];
+static u8 kgdbfdc_wbuf[4];
 
 static void __iomem *kgdbfdc_setup(void)
 {
@@ -1215,7 +1215,7 @@ static int kgdbfdc_read_char(void)
 /* push an FDC word from write buffer to TX FIFO */
 static void kgdbfdc_push_one(void)
 {
-	const char *bufs[1] = { kgdbfdc_wbuf };
+	const u8 *bufs[1] = { kgdbfdc_wbuf };
 	struct fdc_word word;
 	void __iomem *regs;
 	unsigned int i;